Top two aides quit McCain's 2008 campaign

Republican John McCain's top two aides quit his struggling presidential campaign on Tuesday, dealing a sharp blow to the Arizona senator and casting doubt on the future of his 2008 bid.

McCain said he would push ahead with his White House run despite the departures of manager Terry Nelson and longtime chief strategist John Weaver, which was announced as he took the Senate floor to defend President George W. Bush's strategy in Iraq.

McCain, once a front-runner in the Republican field, has fallen behind as his staunch backing for Bush on the unpopular Iraq war and on immigration cost him support among both moderates and conservatives.

Looks like Richard Burr hitched his wagon to the wrong star.