We're already seeing problems with Obamacare such as the glitch in software. Evan Bayh will have to defend his vote for it. I can see our party getting all over him for being part of the problem and being the deciding vote in the senate to end the filibuster as every single one of the 60 Democrats could be labeled as. This is why he didn't run for re-election. I'm sure he didn't just happen to want to spend time with his family like every other politician who retires or steps down.
There are no deciding votes in the Senate. Plus, it's gonna be pretty hard to nationalize a gubernatorial race against one of the states most popular politicians, especially one as well liked and connected as Evan Bayh.