It was the kind of meeting that conspiratorial conservative bloggers dream about. A month after President Barack Obama won reelection, top brass from three dozen of the most powerful groups in liberal politics met at the headquarters of the National Education Association (NEA), a few blocks north of the White House. Brought together by the Sierra Club, Greenpeace, Communication Workers of America (CWA), and the NAACP, the meeting was invite-only and off-the-record. Despite all the Democratic wins in November, a sense of outrage filled the room as labor officials, environmentalists, civil rights activists, immigration reformers, and a panoply of other...