He doesn't need Clinton on the ticket to get her voters on board. I think the best running mate would be Edwards (assuming he would want the job), he appeals to her voters as well and is a young, intelligent guy who could well be a great follow up for Obama in time.

Anybody calling himself/herself a Democrat would not vote for McCain or any other Republican candidate. Not if they are sincere to themselves about who is responsable for the mess the USA is in now. That is after all the GOP and their leadership. The ones switching from Democrat to Republican are either Limbaughs Operation Chaos people or closet Republicans who will only vote Democrat if it suits their republican ideas.