Sen. Olympia Snowe , R - Maine , surprised political world with her decision not to run again . ` ` I think she lost hope , '' a fellow Senate Republican said . Avlon : She is the latest in a string of Senate centrists to announce retirement . Despite this , some centrists remained including Sen. Mark Warner , D - Virginia .
Sen. Olympia Snowe , R - Maine , surprised political world with her decision not to run again . ` ` I think she lost hope , '' a fellow Senate Republican said . She is the latest in a string of Senate centrists to announce retirement . Despite this , some centrists remained including Sen. Mark Warner , D - Virginia .