Unity, it seems, is harder than it looks. Democrats watched the GOP convention with glee last week, with its relatively lackluster attendance and the divide between Donald Trump and Ted Cruz deepening, after Cruz was booed off the GOP stage when he wouldn't endorse Trump. 
 
 But then Democrats found themselves on the receiving end of boos this week --- DNC Chair Debbie Wasserman Schultz was jeered (it effectively ended her participation in the convention), and convention speakers contended with their share of jeering, as well, as Sanders supporter and comedian Sarah Silverman, Sen. Al Franken of Minnesota, Elizabeth Warren and even Bernie Sanders were all booed. 
 
 At this point, it looks like it could be a long week on the road to unity. 
 
 Here's CBS News' guide for what to watch Tuesday, Day 2 of the convention: 
 
 Protests inside 
 
 Top Democrats struggled Monday to keep tensions from boiling over inside the arena -- expect to see more of that Tuesday. One Sanders delegate explained the phenomenon well in a tweet that summed up why the Bern keeps on burning. 
 
 Iowa delegate @chris_laursen: "Bernie basically fed us a bunch of Mountain Dew and now he wants us to go to bed. It's not going to happen." — Jason Noble (@jasonnobleDMR) July 25, 2016 
 
 Those protesters primed for a fight could make trouble Tuesday, the day Clinton is formally nominated, which leads us to the next thing we're watching. 
 
 The roll call 
 
 Starting late Tuesday afternoon, at about 4 p.m. ET, the roll call for the states will begin -- this is the process of formalizing Hillary Clinton's status as the Democratic nominee. There are a couple of ways this could play out. 
 
 In 2008, when the roll call got to New York, Clinton made a motion to halt the voting and nominate then-Sen. Obama by acclamation, thus stopping the vote and formalizing Mr. Obama's nomination. No muss, no fuss. 
 
 The Associated Press has said Sanders has said he wants a full roll call to show all the delegates he won. If Clinton were to be nominated by acclamation, that could lead to yet more jeering and booing. 
 
 At his speech Monday, Sanders told the cheering, weeping, shouting crowd, "I look forward to your vote during the roll call tomorrow night." 
 
 Clinton Press Secretary Brian Fallon said Monday he expected a roll call vote. "It is exactly in keeping with our philosophy that every vote should count and that means every delegate being counted on the floor of the convention," he said. 
 
 Democrats and guns 
 
 The second day of the convention will be dominated by gun violence and its impact on families -- Day Two's theme is officially "a lifetime of fighting for children and families." Many of the speakers will be mothers who have lost their children to gun violence, including Eric Garner's mother, Gwen Carr; Sybrina Fulton, Trayvon Martin's mother, and the mother of Michael Brown, Lezley McSpadden. 
 
 The main speaker of the evening is the presumed nominee's husband, former President Bill Clinton, and he has a high bar reach - his own speech from 2012. 
 
 Bill Clinton 
 
 Few people in American politics can argue a case like the former president can. 
 
 CBS News' Julianna Goldman recalled that the president (Obama, that is) has joked that Bill Clinton is the secretary of explaining stuff -- and for the president's r-eelection campaign, he did just that. In 2012, he gave what may have been the best speech of the convention -- a better argument for President Obama's economic path out of the financial crisis than even Mr. Obama gave himself. 
 
 Will he be able to replicate that effort for his wife Tuesday night? 
 
 Goldman also says she'll be watching to see "whether the Clinton campaign continues to blame the Russians for the DNC hack." 
 
 CBS News' Steve Chaggaris contributed to this report ||||| From Sen. Bernie Sanders sealing Hillary Clinton as the Democratic presidential nominee to former president Bill Clinton’s speech, here what happened at Day 2 of the Democratic National Convention. (Thomas Johnson/The Washington Post) 
 
 From Sen. Bernie Sanders sealing Hillary Clinton as the Democratic presidential nominee to former president Bill Clinton’s speech, here what happened at Day 2 of the Democratic National Convention. (Thomas Johnson/The Washington Post) 
 
 Hillary Clinton on Tuesday became the first woman to be nominated for president by a major political party on a historic night during which her campaign also sought to reintroduce her to skeptical voters and calm continuing tensions here. 
 
 Part of that task fell to former president Bill Clinton, who delivered a keynote speech at the Democratic National Convention that began by recounting his courtship of his wife and detailed her lengthy career in public service, including helping children, immigrants and people with disabilities. 
 
 “She’s the best darn change maker I ever met in my entire life,” the former president said. “This woman has never been satisfied with the status quo on anything. She always wants to move the ball forward. That’s just who she is.” 
 
 Bill Clinton also argued that Republicans had tried to turn his wife into a “cartoon” during their national convention last week in Cleveland. 
 
 “What’s the difference in what I told you and what they said?” he asked. “One is real, and the other is made up. . . . You just have to decide which is which, my fellow Americans.” 
 
 1 of 60 Full Screen Autoplay Close Skip Ad × Scenes from the second day of the Democratic National Convention in Philadelphia View Photos Follow along as Post photographers document the Democratic National Convention in Philadelphia. Caption Follow along as Post photographers document the Democratic National Convention in Philadelphia. July 26, 2016 Former president Bill Clinton takes the stage to address the convention. Ricky Carioti/The Washington Post Buy Photo Wait 1 second to continue. 
 
 Hillary Clinton, along with her daughter, Chelsea, are scheduled to address the convention Thursday, when she formally accepts the nomination. But Tuesday night, she appeared on a large screen, remote from New York, thanking the delegates for helping her put “the biggest crack in that glass ceiling yet.” 
 
 [Winners and losers from the 2nd night of the Democratic convention] 
 
 Clinton formally secured the nomination earlier in the night during the roll call of states, which ended with a symbolic gesture: Her primary rival, Sen. Bernie Sanders of Vermont, asked that Clinton be declared the nominee by acclamation, a move that prompted resounding cheers. 
 
 Soon after, Clinton sent out a video on Twitter showing Sanders’s remarks and declaring “Stronger together,” her campaign motto. 
 
 Sanders’s action, however, was not sufficient to bring onboard all of his delegates, some of whom walked out of the hall in protest. That added to the party’s difficulties this week in displaying unity as Clinton fights a pitched battle against Republican nominee Donald Trump. 
 
 The program then turned to a long series of speakers offering testimonials to Clinton’s character and record of service. 
 
 [Only the Clintons: Why Bill’s speech tonight will be unlike anything we’ve ever seen] 
 
 They included a series of mothers who have lost their children to gun violence or in police custody and are now fighting for reforms. 
 
 “Hillary is one mother who can ensure our movement will succeed,” said Sybrina Fulton, the mother of Trayvon Martin, who was fatally shot by a neighborhood-watch volunteer in Florida. 
 
 Chants of “black lives matter” could be heard in the convention arena as the women, who call themselves “The Mothers of the Movement,” made their emotional presentations. 
 
 Roll call vote 
 
 During the roll call of states, Clinton, a former secretary of state, secured the 2,383 delegates needed to win the party’s nomination when the South Dakota delegation cast its votes. 
 
 Sanders, the runner-up for the nomination, appeared on the convention floor at the end of the process and made a motion to suspend the rules. 
 
 “I move that Hillary Clinton be selected as the nominee of the Democratic Party for president of the United States,” Sanders said. 
 
 With the motion seconded, a loud roar of aye’s arose, making her the nominee at 6:56 p.m. Eastern. 
 
 [As Clinton makes history, some already take it for granted] 
 
 The orchestrated show of unity followed a rocky first day of the convention Monday, when it became clear that some of Sanders’s supporters were not ready to accept Clinton as the party’s nominee despite the senator urging them to do so. 
 
 After the roll call, some exited the hall, chanting, “Walkout! Walkout! Walkout!” As the program continued, most of the seats in delegations from Maine, Kansas, Alaska and Oklahoma — all states Sanders won against Clinton — were empty. 
 
 Several Oregon delegates, meanwhile, wrapped black cloth around their jaws, as gags, and headed into the hallway of Wells Fargo Center. There they met dozens of angry delegates from other states. 
 
 The anger of the protesters was fueled in part by leaked emails showing that some Democratic National Committee staff members discussed ways to help Clinton and hurt Sanders in the primaries. The party’s chairwoman, Debbie Wasserman Schultz, announced her resignation Monday after the revelations. 
 
 Ryan Drundle, a Sanders delegate from Louisiana, walked out wearing a button with the unprintable initialism DNC GFY. 
 
 “The whole election process has been a farce from the get-go,” Drundle said. “There are a dozen states with election-fraud investigations, and nobody’s saying anything about it. It’s a sham.” 
 
 The nominating process began shortly before 5 p.m., with Sanders’s name put forward by Rep. Tulsi Gabbard (D-Hawaii). She affectionately called him a “somewhat frumpy, and maybe even sometimes grumpy, 74-year-old guy” who created a progressive movement. 
 
 Sanders sat in the convention hall next to his wife, with a broad smile on his face, as a pair of seconding speeches followed. He stood up and waved to the crowd afterward amid an extended ovation. 
 
 Clinton was nominated by Sen. Barbara A. Mikulski (D-Md.), the dean of women senators, who said she was putting forward the former secretary of state’s name “on behalf of all the women who have broken down barriers.” 
 
 Mikulski was followed by Rep. John Lewis (D-Ga.), the revered civil rights leader, who referenced another “glass ceiling” that was broken with President Obama’s election eight years ago, and Na’ilah Amaru, a Clinton supporter and Iraq veteran who won an online contest to nominate the candidate. 
 
 When Illinois — Clinton’s birthplace — got its chance in the roll call, the honor of casting votes was given to her childhood friend Betsy Ebeling. 
 
 “On this historic, wonderful day, in honor of Dorothy and Hugh’s daughter and my sweet friend — I know you’re watching,” Ebeling said, her voice heavy with emotion. “This one’s for you, Hill.” 
 
 She called out Illinois’s 98 votes for Clinton and let out a final “Yes!” 
 
 Speaking for Clinton 
 
 After the nomination was complete, speakers offered testimonials about Clinton’s public service across a range of areas, and her campaign aired an accompanying series of videos with archival footage showing her efforts. 
 
 The program, billed as “Fights of Her Life,” appeared aimed at rehabilitating the image of a candidate with unusually high unfavorable ratings — though not quite as high as her Republican opponent’s — and deep-seated trust issues. 
 
 Speakers talked about Clinton’s work for women and families, social justice, health care and global security, among other issues, her campaign said. 
 
 They included former Vermont governor Howard Dean (D), who recounted Clinton’s efforts to help create the Children’s Health Insurance Program while she was first lady. 
 
 “She never forgot who she was fighting for,” Dean said. 
 
 The presentations also paid tribute to Clinton’s tenure of secretary of state, highlighting efforts to fight human trafficking as well as various diplomatic endeavors. 
 
 “She sees a world where girls are not captured and sold, but are fearless and bold,” said Sen. Amy Klobuchar (D-Minn.). 
 
 [Democrats’ near-silence on national security may give Trump an opening] 
 
 Clinton’s campaign manager, Robby Mook, said that Tuesday night’s programming is designed to remind Americans about the former secretary of state’s long public-service career. 
 
 “A lot of people aren’t familiar with her accomplishments,” Mook told ABC’s “Good Morning America.” 
 
 Bill Clinton addressed a Democratic convention as a political spouse for the first time. 
 
 Clinton — who could soon become the country’s first “first man” — has been a Democratic convention staple for more 20 years. His 1988 keynote address was widely panned as a meandering, boring speech, but his 1992 nomination acceptance speech buoyed his struggling campaign. In more recent years, the former president has served as a political character witness, most notably for Obama at his 2012 convention. 
 
 Abby Phillip and Sean Sullivan contributed to this report. 
 
 Read more: 
 
 Fact Checker: Claims against Donald Trump 
 
 Neither Warren nor Sanders pulled a Ted Cruz. They didn’t give Hillary Clinton a bear-hug either. 
 
 Democrats’ opening day of discord ends on a high note ||||| Bill Clinton’s ‘change’ pitch 
 
 Former President Bill Clinton’s speech offered an intimate tribute to Mrs. Clinton, describing for a rapt audience their courtship and early marriage — and their upward climb together in politics. 
 
 His most telling praise, however, was about Mrs. Clinton’s grit as a reformer. With Donald J. Trump casting the 2016 election as a choice between drastic change and an unhappy status quo, the former president insisted that Mrs. Clinton, rather than her opponent, is best prepared to wrest change from an unwilling system. 
 
 Mr. Clinton asked voters to cast aside the “cartoon” version of Mrs. Clinton promoted by Republicans, and urged them to think optimistically about the future. “Life in the real world is complicated, and real change is hard,” he said. Of his wife, Mr. Clinton said, “She is the best darn change-maker I have ever known.” 
 
 Democrats have long aimed to beat Mr. Trump by discrediting his promises of change. But Mr. Clinton’s speech confirmed that Democrats know they must do more than that, and that they must compete hard for the votes of people who want Washington overhauled from top to bottom. 
 
 Leaning into the Russian connection 
 
 Mr. Trump was rarely mentioned on Tuesday night; the night’s headliner, Mr. Clinton, did not mention him at all. But the most prominent speakers who went after Mr. Trump attacked him on a notable theme: his friendly stance toward President Vladimir V. Putin of Russia. 
 
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 Gov. Terry McAuliffe of Virginia warned against “giving the nuclear codes to a man who praises Vladimir Putin and Saddam Hussein.” Madeleine Albright, a former secretary of state, rebuked Mr. Trump for praising those two leaders and Kim Jong-un, the leader of North Korea. And she alluded to the release of hacked emails from the Democratic National Committee to suggest outright that Russia is boosting Mr. Trump. 
 
 “Putin is eager to see Trump win,” Ms. Albright said, “and that should worry every American.” 
 
 Mr. Trump has dismissed suggestions that Mr. Putin is trying to help him, but he has also not shied away from praising the Russian strongman. Democrats signaled that they intend to tie him closely to Mr. Putin in the fall campaign. 
 
 A careful message on policing and civil rights 
 
 Republicans had a simple message last week on policing, led by Mr. Trump’s blunt calls for stronger “law and order.” Democrats had to deliver a more nuanced set of views — voicing the party’s mounting concerns about racial bias in policing, while paying tribute to law enforcement amid a rash of police killings. 
 
 That textured message came through in a series of speeches by lower-profile figures: black mothers who lost children to gun violence and in run-ins with the police, and a former New York City police detective who helped handle the aftermath of the Sept. 11, 2001, attacks. And Eric H. Holder Jr., a former United States attorney general, called both for defending the police and for attacking inequities in the justice system. 
 
 “The majority of police officers are good people doing a good job,” said Lucia McBath, the mother of a black teenager in Florida who was shot and killed by a driver after an argument over loud music. “And we’re also going to keep using our voices and our votes to support leaders like Hillary Clinton, who will help us protect one another so that this club of heartbroken mothers stops growing.” 
 
 The revolution peters out 
 
 Photo 
 
 The worst of the Bernie Sanders-bloc tantrums may be over. After the roll-call vote that anointed Mrs. Clinton the Democratic nominee, dozens of Sanders supporters stormed out and encamped in one of the media tents, holding forth to throngs of reporters about their anger at the party and its presidential candidate. 
 
 But inside the hall, the loud disruptions of Monday evening had faded. When Mr. Clinton mentioned the trade deals of the 1990s, which Mr. Sanders has blasted, there was no jeering from the crowd. Mrs. Clinton will still have to shore up her support on the left, but the Democratic nightmare scenario — a convention plunged into chaos and recriminations — appears to have been averted. 
 
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 It was ’90s night in Philadelphia 
 
 For a party with an image of relative youth and dynamism, the Democrats showcased a very familiar set of faces. At times, the speaking lineup could have come out of a Democratic convention in 1996 or 2000: Ms. Albright; Mr. McAuliffe, a longtime Clinton ally; Donna Brazile, the acting party chairwoman who managed Al Gore’s 2000 campaign; and, most of all, Mr. Clinton himself. 
 
 There were newer stars who spoke on Monday — like Senators Elizabeth Warren and Cory Booker — and others set to speak later in the week. But the convention’s second night highlighted the durability of a party establishment that has managed Democratic politics, on and off, for a quarter-century, holding onto power even during the anti-establishment 2016 campaign. 
 
 The lineup was striking, in part, because of the absence of similar leaders last week at the Republican National Convention, as the Bush family and its political network mostly sit out the 2016 race.
– The name organizers hope will be on everyone's mind during the second night of the Democratic National Convention on Tuesday—besides Hillary Clinton's, of course—is that of her husband. Bill Clinton will headline the evening four years after giving what CBS News calls a better pitch for President Obama than even Obama himself gave during the 2012 DNC. “For a generation now, this has been a safe bet: If it’s a Democratic convention, Mr. Clinton will be making a speech people will remember," the New York Times states. But there's another name that could once again take center stage: Bernie Sanders. The Washington Post reports the Clinton and Sanders campaigns are working together to give Sanders a bigger role Tuesday, including Sanders possibly being the one to formally nominate Clinton, in order to calm protests. Tuesday will see the state roll call to officially nominate Clinton for president. In 2008, Clinton stopped the roll call to allow Obama to be nominated without further delay. CBS reports Sanders isn't expected to do the same. It's possible giving Sanders' delegates the chance to officially vote for him will be enough to soothe some vocal Clinton critics, according to the Times. Either way, the roll call will mark a historic moment: the first time a major party has nominated a woman for president. The official theme for Tuesday is "a lifetime of fighting for children and families," with a focus on gun violence. To that end, the mothers of Eric Garner and Trayvon Martin are scheduled to speak. Other speakers include Jimmy Carter, Nancy Pelosi, and Lena Dunham.