OREM — Rep. Chris Cannon's radio ads in the weeks before his convincing Republican primary victory conjured up images of a vast national conspiracy mobilized against him. "I just wish the special interests would quit their negative attacks," a woman's voice said in one radio spot for Cannon. And it was true that for months, Cannon was attacked in the media for sponsoring a bill that would provide temporary legal status to undocumented workers. The ads, on radio and billboards and in newspapers, were paid for by out-of-state groups that want to unseat Cannon and other like-minded Republican members...