Who does better against McCain, Obama or Clinton?
Fortunately, we do have some data on this. RealClearPolitics has been tracking head-to-head polls of Clinton vs. McCain and Obama vs. McCain. Here are their averages:
McCain vs. Clinton: McCain +1.9%
McCain vs. Obama: McCain +0.6%
So according to RCP, Obama polls slightly better against McCain than Clinton does.
This data also shows that the Democrats will have their work cut out for them taking McCain down. I think tying him to the deeply unpopular Iraq occupation is one way to go on this.