Sen. Evan Bayh Announces Retirement - (CBS/AP)

Centrist Democrat from Indiana Criticizes Partisanship in Washington; Seat Could Swing to GOP
The senator criticized the partisan atmosphere in Washington but took pains to make clear that his departure was not a reflection on his Senate colleagues or the president. - Sen. Evan Bayh Announces Retirement

Indiana's Bayh To Retire From Senate - NPR
Two-Way: Bayh Cites Partisanship

Snipers Harass U.S., Afghan Troops