Sen. Lindsey Graham, Republican of South Carolina, is a jovial sort, but he was scowling like a man who'd just discovered that he might have boarded the wrong bus. "How do we put together a bill and then the guy who put it together says that he may not vote for it?" Graham asked me. "I just don't get what we're doing here." His specific complaint: that GOP Sen. Marco Rubio of Florida, a fellow member of the Senate "gang of eight" who had spent months drafting a bipartisan immigration refor… [more]