Far from the portrayal he presents of himself as an unflinching maverick with a consistent and reliable record, McCain has demonstrated an unwavering commitment to taking whatever position will advance his own career. He "is the classic opportunist," according to Ross Perot, who worked closely with McCain on POW issues. "He's always reaching for attention and glory."

Then there's torture — the issue most related to McCain's own experience as a POW. In 2005, in a highly public fight, McCain battled the president to stop the torture of enemy combatants, winning a victory to require military personnel to abide by the Army Field Manual when interrogating prisoners. But barely a year later, as he prepared to launch his presidential campaign, McCain cut a deal with the White House that allows the Bush administration to imprison detainees indefinitely and to flout the Geneva Conventions' prohibitions against torture.