OK here are the scenarios for reasons why Evan Bayh is retiring:
1. getting out to save the ego bruise of losing in November.
2. Cashing in as the next head of PHarma or some other lobby group.
3. The wife finally got tired of his philandering and she’s leaving him.
4. He’s gearing up to run in 2012 against Obama from the right.
5. Sort of like #3 but with a dead girl.
6. He’s been bought off and in exchange for being a lap dog for the next 8 months
BTW, I think it is probably #1