The Senate climate bill is in limbo after Republican co-sponsor Lindsey Graham of South Carolina withdrew his support. On Saturday, Graham said he no longer backs the measure because Democrats want to advance an immigration bill first. Graham and co-sponsors Senator John Kerry of Massachusetts and Independent Senator Joe Lieberman of Connecticut had been scheduled to unveil the climate measure today. Graham says he thinks Democrats are pushing for immigration reform to mobilize Hispanic voters and wants Democrats to pledge they’ll first tackle the climate bill. In a statement, Senate Majority Leader Harry Reid rejected Graham’s claims and said he hopes to pass both climate and immigration legislation by the end of the year.