Barack Obama is on a foreign tour trying to demonstrate he's ready to be the US Commander in Chief. Only 48 percent of all Americans think he's qualified for that role, while 72 percent say that about John McCain. We take a look at McCain's record in the military and US Senate. Did his experience during the Vietnam War shape his view of the world for better or worse? Would his instincts as a "maverick" politician help him to keep the nation secure, or should consistency be the measure of leadership?