1. Sen. Lincoln Chafee (R.I.) Once approached by Democratic Leader Harry Reid to switch parties, Chafee has long supported liberal policies. He backs legal abortion, gay rights, federal-funded health care, strict environmental protections and a higher minimum wage. Opposes ANWR drilling. Also was the only Republican in Congress not to endorse the President's reelection and one of three who tried to gut Bush's tax cuts. 2. Sen. Olympia Snowe (Maine) A self-described "centrist," Snowe scored a 100% pro-choice voting record as scored by NARAL and consistently votes with Democrats on social issues. 3. Sen. Arlen Specter (Pa.) "Snarlin' Arlen" warned...