ADDED: Check out the memorable moments page, which includes:
Al Gore concession in 2000 election
Bill Clinton 1987 press conference where he says he will not be a candidate in 1988
Barack Obama 2004 convention speech
George W. Bush announcing the capture of Saddam Hussein
Ronald Reagan and Gorbachev summit in late 1987.
Clarence Thomas testifying that he did not watch Anita Hill testifying.
Bill Clinton grand jury testimony
Dan Quayle and Murphy Brown
Medal of Freedom Award to Margaret Thatcher
George H.W. Bush inviting Dana Carvey to the White House where he impersonates Bush 1992
