That would be an incredible shot in the arm for Obama because then he could benefit from Bill Clinton's seemingly ever increasing popularity.
Doesn't sound that far-fetched to me either, since the last poll I saw already had Obama second only to Rudy in popularity, followed by McCain, with Kerry coming in dead last.
Source-
http://www.quinnipiac.edu/x1295.xml?ReleaseID=990
Should be noted that almost half the respondents said they didn't know enough about Obama to rate him. Hillary came in at 9th, is well enough known by 99% for a rating, and still came in behind Rice(

), Lieberman, and Edwards. Interestingly, Bill Clinton came in 5th (after Condi, which I find hard to believe.)
From what I've read, it seems Hillary is way overmatched by Obama with the Independent Vote. (Big shock, right?)