Let's dispel the notion that Marco Rubio did not know who he was talking to. When Rubio walked into the lobby of the Columbia Hampton Inn this morning -- conveniently the same one where the Daily Pennsylvanian staffers are posting up in South Carolina and were eating breakfast around 10:30 a.m. -- he was presumably not expecting to run into Rafael Cruz, father of presidential candidate Ted Cruz, and Cruz campaign staffer Christian Collins. However, once he saw them he decided to have some fun with them."Got a good book there," Rubio said to Collins, a young Cruz staffer in...