Call it open mic day in the House GOP conference. Republicans are set to huddle behind closed doors Wednesday afternoon to discuss the politically complicated issue of immigration. What to expect in the meeting? Some pretty stark differences in opinion in a group that has mostly refused to march in lockstep on a variety of other fronts. Further complicating matters is the fact that GOP leaders are expected to hear a variety of viewpoints Wednesday on border security, visas, and the most contentious question of all, whether illegal immigrants should be offered a path to citizenship or legal status. Rep....