GLENDALE, Ariz. – Sen. John McCain hasn't always talked tough on immigration. That haunted his presidential ambitions, and now his political survival hinges on whether he can show that his conversion is genuine. It hasn't been easy. Boycotts, vigils and a legal fight over the state's attempted crackdown on illegal immigrants have kept voters attuned to each nuance in his run for re-election. "Since 2007, I've said we have to secure the border first. I said it in 2008 and 2009 and 2010," McCain told 120 people at a town hall meeting in suburban Phoenix. Leaning against the back wall...