The fate of the Employee Free Choice Act (EFCA) over the course of the past year and a half has been largely determined by the White House. Rahm Emanuel would not let it come up for a vote until after health care was passed, and by that time the Democrats no longer had 60 votes in the Senate. But its evolution is also intimately tied to the electoral prospects of Harry Reid and Arlen Specter, and unless you understand one, you can’t understand the other.