Was it because Romney is too wealthy (and has nauseated the country)?
Was it because Lieberman is not a right-wing Christian?
Was it because Pawlenty is a man?
Was it because there is no well-known Republican possibility who wouldn't be a liability for McCain?
Was it because he thought he needed someone who, like Biden, has a "compelling personal story"?
Or was it because McCain wants the focus to be on him and him alone, so he picked a candidate who would "Palin" comparison?