After Barack Obama's clinching of the nomination in June 2008, speculation that she would be a contender for the vice-presidential slot on the Democratic ticket continued. The "Washington Post" listed her as the top prospect for the 2008 nomination. James Carville and Bob Novak also mentioned Sebelius' name, and Wesley Clark, also considered a potential running mate, publicly endorsed Sebelius, referring to her as "the next vice-president of the United States". Speculation that the Vice Presidential nomination lay in her future was heightened by the fact that she was chosen by the Democratic Party's congressional leaders to give their party's official response to Republican President George W. Bush's 2008 State of the Union Address. The next day, she endorsed Obama's campaign, one week before the Kansas caucus on Super Tuesday. Obama won the caucus easily, with 74% support.