The anatomy of a rumor: Last night, a man named Steve Emerson, "terrorism expert," was called upon to talk about the Boston bombing on jumped-up carnival barker Sean Hannity's Fox News program. Citing unnamed sources, Emerson told Hannity that Abdulrahman Ali Alharbi, the 22-year-old Saudi national once considered a "person of interest" in the Boston case, was to be deported by the U.S. government on Tuesday "on national security grounds." "This is the way things are done with Saudi Arabia," said Emerson. "You don't arrest their citizens, you deport them because they don't want them to be embarrassed and that's the way we appease them."