"Lindsey Graham is a Republican Senator from South Carolina. His highest risk of losing his seat, by far, comes from the prospect of a conservative primary challenger. Indeed, I'd say that prospect is far from remote, and Graham is displaying an unusual willingness to risk his political future. He has little incentive to negotiate on these issues except that he believes it's the right thing to do. So when Democrats put climate change on the backburner to take up immigration, and so so for obviously political reasons, Graham has every right to be angry. He's risking his political life to address a vital issue, and Harry Reid is looking to save his seat," - Jon Chait.