Bill Maher.. and this is one reason why....
"You heard about the big John McCain gaffe. He was on the David Letterman show announcing his presidential campaign, and he pulled a Joe Biden. ... He used the word 'wasted' to describe the lives lost in Iraq. Next day, he said he should have used the word 'sacrifice'. But to put it into perspective, when McCain was a prisoner in Vietnam, George Bush was wasted. Sorry, I meant to say he was sacrificing brain cells."