Despite many months of campaigning and hours of TV exposure, Barack Obama remains a puzzle to millions of potential voters. Is he a high-minded idealist with the vision and the capacity to get America back on track, or another Machiavellian politician who just wants to win? We hear about core values, the flip-flop on public financing and fighting the unfounded rumors. Can he win over skeptics with his oratorical skills? Is he in need of a Big Idea?