Another blue dog bites the dust:

Sen. Evan Bayh will not run for re-election, a decision that will shock Democrats and Republicans alike in Indiana.

In prepared remarks, Bayh, 54, cited excessive partisanship that makes progress on public policy difficult to achieve as the motivation for his decision.

“After all these years, my passion for service to my fellow citizens is undiminished, but my desire to do so in Congress has waned,” he said.

“My decision was not motivated by political concern,” he added. “Even in the current challenging environment, I am confident in my prospects for re-election.”