By not doing so he'll lose out on a lot of Hillary supporters, they're demanding this. He might cave, I use to like Hillary until she sold her self off to corporate interests. Honestly though the faster the Dems unite, the easier it'll be to snuff McCain, you might get a lot of Hillary supporters just not even going to the ballots a lot of missed votes he can snag.
And didn't she bring up Obama's similarity to JFK because of the whole Mafia thing? JFK had Mob ties, and it's been thought Obama does too. (I mean seriously, he's backed by Opera LOL)