I’m just waiting for some huge scandal about The Chosen One to break just prior to the convention (or even during it) and then have Her Thighness lobby the superdelegates to switch their votes to her.
I’ve been thinking this exact same thing all along. That would be fun to watch!
I think if some scandal erupts, it will be interesting to see how he responds to it. The Democratic tactic for dealing with any scandal usually involves feigning outrage, claims that the source of the scandal isn't credible, or makes statements that the scandal is "old news" that's been previously addressed.
If Obama does none of those, and just acknowledges whatever hypothetical scandal exists, I'd say the fix is in, and this has been the plan all along. He'll want to be careful how he goes about it, so as not to incite blacks to violence. If any of his supporters see his potential stepping down as racially-motivated, there will be riots.