Bill Clinton to Take the Stage at the Democratic Convention

Tonight, former President Bill Clinton will be the prime time speaker who nominates the current President Barack Obama for re-election. Republicans claim he'll just remind voters of better days. Is he a risky choice for prime time? Will he overshadow the man he'll nominate? We talk about a stormy relationship with the biographer of both Clinton and Obama, whose relationship is one of the most fascinating in current American politics.