WASHINGTON/NEW YORK Hillary Clinton will announce her second run for the presidency on Sunday, starting her campaign as the Democrats' best hope of fending off a crowded field of lesser-known Republican rivals and retaining the White House. 
 
 The overwhelming favorite for the Democratic presidential nomination, Clinton will nonetheless face multiple challenges as she returns to the campaign trail seven years after losing the nomination in 2008 to Barack Obama. 
 
 She has been a high-profile figure in American politics for more than two decades since her husband, Bill Clinton, won the presidency in 1992, and her fame still eclipses the other likely Democratic contenders and Republican opponents. 
 
 But with the fame comes a set of challenges Clinton will need to overcome in the coming months. She will try to get past a controversy over her use of personal email while secretary of state, and find a way to connect with ordinary Americans after her years as the top U.S. diplomat. 
 
 Her advisers, including her husband, have urged her to take nothing for granted, arguing voters would be repelled by anything that resembles a pre-ordained coronation. 
 
 A Democrat close to the Clinton camp told Reuters on Friday that Clinton, who is also a former U.S. senator, would announce her long-anticipated plans through video and social media. 
 
 After the announcement, she will travel to the early voting states of Iowa and New Hampshire, said the source, who asked to remain unidentified. 
 
 A representative for Clinton declined to comment. 
 
 Clinton, 67, has sounded out potential campaign themes during public appearances, casting herself as both a love-filled new grandmother with a vested concern in the future and a wise former diplomat who understands how countries thrive and fail. 
 
 In contrast to her 2008 campaign, Clinton has shown signs she will not play down how being a woman distinguishes her from the 44 men who have served as U.S. president. 
 
 She has filled speeches with paeans to the moral and economic importance of gender equality and women's rights, arguing that economic growth, the health of the middle class and the stability of foreign peace treaties all hinge on reducing gender discrimination. 
 
 "Just think about all the hard-working families that depend on two incomes to make ends meet," Clinton said in a paid speech at a conference for women technology executives in California's Silicon Valley, citing her own experience of raising a young daughter while working as a partner at an Arkansas law firm in the 1980s. "When one is short-changed, the entire family suffers." 
 
 What this might mean in terms of policy proposals is vague, although Clinton said in the same speech she was "embarrassed" that the United States remained one of the few countries where there is no national right to paid family leave. 
 
 There are a dozen or so likely Republican contenders vying for the presidency, many still relatively unknown. Clinton has a different task: reassuring voters who already like her and wooing those who do not. 
 
 Only 2 percent of Americans say they have never heard of her, according to a Gallup poll last month, a level of name recognition exceeding that of Vice President Joe Biden, a name unknown to a 10th of Americans. 
 
 Her nearest likely rivals for the Democratic nomination, former Maryland Governor Martin O'Malley and Jim Webb, the former U.S. senator from Virginia, struggle to get a fraction of Clinton's media coverage, favorable poll numbers and donations. 
 
 Clinton's use of social media to announce her White House run amounts to the adoption of tactics deployed by Obama in 2008 to raise large sums through small donations and appeal to young voters. 
 
 Also on Friday, Clinton released an update to her memoir, "Hard Choices," in which she described her final days as secretary of state and her feelings about her first grandchild. 
 
 CONTROVERSY AND CRITICISM 
 
 Clinton has been a target for Republican criticism since Bill Clinton's first presidential campaign. He promised voters then that they would get "two for one" by putting them both in the White House, but quickly dropped that claim when it proved unpopular. 
 
 Hillary Clinton's biggest initiative while her husband was president, national healthcare reform, fell apart without coming to a vote in Congress. 
 
 She became a figure of public fascination, and admiration in some quarters, for standing by her husband when allegations of his sexual infidelities first surfaced during his 1992 presidential campaign, and again in 1998 when his affair with White House intern Monica Lewinsky surfaced. 
 
 Both the Clintons have been investigated repeatedly by Republican lawmakers and the then United States Office of the Independent Counsel. 
 
 As Hillary Clinton prepared to start her campaign, she faced criticism from Republicans for using only a personal email account while secretary of state, and for the Clinton Foundation's reliance on donations and payments from foreign governments for its philanthropy work abroad, even as she served as the country's top diplomat. 
 
 Clinton has said she should have used a government email account as secretary of state while insisting that she had violated no rules. 
 
 During the campaign, Clinton will be expected to say whether she will more closely align with the centrist economic policies of her husband's administration or the populist policies championed by the progressive wing of her party. 
 
 Some Democrats have urged Senator Elizabeth Warren of Massachusetts, a leader of the party's liberal wing and a critic of Wall Street and big banks, to challenge her, but Warren has declined. 
 
 (Additional reporting by Lisa Lambert and Amanda Becker; Editing by Grant McCool and Leslie Adler) ||||| These crawls are part of an effort to archive pages as they are created and archive the pages that they refer to. That way, as the pages that are referenced are changed or taken from the web, a link to the version that was live when the page was written will be preserved.Then the Internet Archive hopes that references to these archived pages will be put in place of a link that would be otherwise be broken, or a companion link to allow people to see what was originally intended by a page's authors.The goal is to fix all broken links on the web . Crawls of supported "No More 404" sites. ||||| We have, at long last, reached the point in the 2016 cycle (what year is it, again?) in which we can start comparing apple-to-apples. Which is to say: We're starting to get good polls from reputable pollsters that allow us to track patterns over time. 
 
 Quinnipiac University put out a new poll Thursday that tracks Hillary Clinton's performance against the panoply of possible Republican challengers in three states: Colorado, Iowa, and Virginia. The nice thing is that they polled in the same states two months ago, so we can see what's changed. 
 
 In short: Clinton's lead against any or all of the tested Republicans has dropped in Colorado and Iowa and increased in Virginia. 
 
 The margins by which she leads (or doesn't) vary slightly, but the trends are all about the same. In other words, the movement here is on Clinton, not on the challengers. If, for example, Clinton was faring worse against Jeb Bush because people had rushed to embrace him, we'd expect to see his line looking significantly different than the other candidates. But with the exception of Scott Walker in Colorado, the lines are almost all the same slope. The change here is in opinions of Clinton, not the rest of the field. 
 
 That's made more evident when we look at favorability ratings for Clinton in the two polls. In Colorado and Iowa, her unfavorables spiked -- meaning that people were increasingly likely to view her unfavorably and decreasingly likely to view her favorably. In Virginia, they were relatively flat. 
 
 In part because they have lower name recognition, the favorables for many of the Republican challengers didn't change much. In the most recent poll, the average percentage of respondents who didn't know enough about Hillary Clinton to have an opinion was 6 percent. The lowest for any of the Republicans was Chris Christie in Colorado -- where a full quarter of the respondents didn't know enough to have an opinion. 
 
 We are so, so early in this thing, and these numbers will change. If nothing else, though, we know this: So far, this race is all about Hillary Clinton. Which, really, is not much of a surprise.
– When, where, how? A source close to Hillary Clinton's campaign tells the Guardian she will tell the world of her intention to run for president on Sunday at noon Eastern, on Twitter, while on her way from New York to Iowa. The Twitter announcement will be followed by a video and an email, says the source, and Iowa will be followed by visits to other early primary states. Clinton's rep wouldn't comment, but another source confirms to the Guardian that she'll soon be in Iowa. The New York Daily News also has a source saying Clinton will announce Sunday, and Reuters says "a variety of sources in the Clinton orbit" confirm an announcement is imminent, though none would pin it to Sunday. Clinton has been building up her operation and staff in Iowa while leasing space for what's thought to be her campaign headquarters in Brooklyn. Contender Rand Paul will be in Iowa today, along with former Democratic senator Jim Webb, who has launched a presidential exploratory committee. Ted Cruz, also an official presidential contender, was in the state yesterday. Marco Rubio is expected to announce his own presidential campaign Monday from Miami. Meanwhile, a recent Quinnipiac University poll that looks at Clinton's lead over potential big-name Republican contenders suggests her support is fading a bit, at least in Colorado and Iowa, but has grown in Virginia, the Washington Post reports.