includes pamphlets and newspaper articles, such as Private Eye, topical television panel shows such as Have I Got News for You and Mock the Week, and television series such as Ballot Monkeys, The Mash Report and Spitting Image. In 2021, political cartoons when successful play a role in the political discourse of a society that provides for freedom of speech and for the press (Thomas Knieper 2007 SOURCE?). Key political cartoonists in the United Kingdom include people such as Peter Brookes who has been a political cartoonist for The Times since 1992 and Nicola Jennings who features regularly in The Guardian. Street art as political satire Street artists like Banksy have used dark political humor and witty political and social commentaries, primarily through graffiti, to comment on various themes such as capitalism, imperialism and war. United States Satire became more visible on American television during the 1960s. Some of the early shows that used political satire include the British and American versions of the program That Was the Week That Was (airing on the American Broadcasting Company, or ABC, in the U.S.), CBS's The Smothers Brothers Comedy Hour, and NBC's Rowan and Martin's Laugh-In. During the months leading up to the 1968 presidential election, Richard Nixon appeared on Laugh-In and repeated the program's catch-phrase "Sock it to me." Other forms of satire of the 1960s and early 1970s typically used the sitcom format, such as the show All in the Family. When Saturday Night Live debuted in 1975, the show began to change the way that comedians would depict the president on television. Chevy Chase opened the fourth episode of the show with his impersonation of a bumbling Gerald Ford. Chase did not change his appearance to look like President Ford, and he portrayed the president by repeatedly falling down on the stage. Some of the other famous presidential impersonations on Saturday Night Live include Dan Aykroyd's Richard Nixon and Jimmy Carter caricatures, Dana Carvey as George H. W. Bush, Darrell Hammond and Phil Hartman as Bill Clinton, Will Ferrell as George W. Bush, Jay Pharoah and Fred Armisen as Barack Obama. Hartman was the first in a long string of cast members to impersonate Donald Trump, who was most famously impersonated by Darrell Hammond and Alec Baldwin, and currently James Austin Johnson impersonates him. Johnson also impersonates Joe Biden, who was also impersonated by Jason Sudeikis and Jim Carrey.