One has to admire the switch solely due to strategery. He went from beatable to almost unbeatable with a fairly obvious choice.
If Donnelly wasn't such a shithead mushmouth who has burned too many bridges he would be wise to consider the same, particularly if Bayh is serious about going back to the Senate (and he is).
Bayh is interested in running against Donnelly? Hope not - any decent Rep should be able to beat Donnelly.
1)This is speculation from some blog, I doubt Manchin is switiching
2)Bayh? What are talking about? His career is over after he lost last year. He certainly is not primarying Donnelly.