Obama continues to do very well in Puritan-descended states, such as Oregon (with the exception of Massachusetts, where the bloom is off the David Axelrod / Deval Patrick rose), but yesterday he got annihilated in another Scots-Irish state, Kentucky. So, that makes Virginia Senator and hillbilly intellectual James Webb all the more plausible as a running mate. It would certainly be the ticket with the best writers on it in a long time.
On the other hand, the idea that Barack Obama might put Jim Webb on the path to being President someday is pretty funny, although probably not to Barack Obama. (What would Rev. Wright say?) So it probably won't happen.