NEW : President praises Jonathan Weinzapfel for devoting `` his career and his life to serving his fellow Hoosiers '' Senator cites failure on jobs bill , deficit reduction panel as examples of broken system . Florida centrist is third Democrats senator to announce retirement . Democrats must defend six open seats in midterm races ; Bayh will have six open seats .
NEW : President praises Bayh for devoting `` his career and his life to serving his fellow Hoosiers '' Senator cites failure on jobs bill , deficit reduction panel as examples of broken system . Indiana centrist is third Democratic senator to announce retirement . Democrats must defend five open seats in midterm races ; GOP will have six open seats .