Via Michelle Malkin, who dubs them the "Bend over Republicans":

Alexander (R-TN)
Bennett (R-UT)
Bond (R-MO)
Chambliss (R-Ga)
Collins (R-ME)
Corker (R-TN)
Graham (R-SC)
Grassley (R-IA)
Gregg (R-NH)
Hatch (R-UT)
Isakson (R-GA)
Kyl (R-AZ)
Lugar (R-IN)
McCain (R-AZ)
Murkowski (R-AK)
Sessions (R-AL)
Snowe (R-ME)
Specter (R-PA)
Voinovich (R-OH)