I think I've finally figured out this Edwards thing. Of course he's had a long time to work on it, so I'm just trying to catch up. But here it is:

               Edwards really wants to run for president in 2012. Knowing that Obama is unelectable in 2008, and John McCain will probably be a one term president, he had to do whatever he could to know Hillary out of the race.
               She, of course, is electable in 2008, and would almost certainly run for a second term.

               So it's just another case of a slick attorney/politician looking out for his own best interests. I really hope it backfires on him.