Halfway through the Democratic presidential primary season, Barack Obama and Hillary Clinton are essentially tied. Super Tuesday didn't decide the race, but there was one big development this week: the departure of Mitt Romney, leaving John McCain the almost certain nominee. (Mitt's final graceless act: attributing his backing out to his worry that a long GOP primary fight could enable Democrats to win and "surrender" to "terrorists.")
I break down each candidate's strengths against McCain in the video below. The only thing I think is clear: If the election is about change, either Clinton or Obama defeat the 100-year-war candidate easily in November -- as long as instigators on both sides can ease up on the ugly, divisive rhetoric. (Subscribe to Salon's daily video podcasts through iTunes and RSS).