U.S. Sen. John McCain, R-Ariz., speaks during a town hall, Tuesday, Feb. 19, 2013, in Sun Lakes, Ariz. McCain defended his proposed immigration overhaul to an angry crowd in suburban Arizona in the latest sign that this border state will play a prominent role in the national immigration reform debate. (AP Photo/Matt York)

Associated Press
U.S. Sen. John McCain, R-Ariz., speaks during a town hall, Tuesday, Feb. 19, 2013, in Sun Lakes, Ariz. McCain defended his proposed immigration overhaul to an angry crowd in suburban Arizona in the latest sign that this border state will play a prominent role in the national immigration reform debate. (AP Photo/Matt York)
U.S. Sen. John McCain, R-Ariz., speaks during a town hall, Tuesday, Feb. 19, 2013, in Sun Lakes, Ariz. McCain defended his proposed immigration overhaul to an angry crowd in suburban Arizona in the latest sign that this border state will play a prominent role in the national immigration reform debate. (AP Photo/Matt York)