Joe Donnelly is talking about taking on Mourdock and running for Senate. Getting a rougher seat in redistricting is likely a good incentive, especially if Mourdock turns out to be the Ken Buck of Indiana in a more balanced year than 2010 was.
That is extremely unlikely.
1. Obama will not win Indiana in 2012, period. No help from the top of the ticket
2. All the stars were aligned for the dems in 2008, when Indiana
did vote for Obama, and they overwhelmingly re-elected conservative, fiscal hawk, reformist Gov Mitch Daniels