FILE - In this March 4, 2013 file photo, opponents of proposed gun control bills being considered by the Colorado Legislature hold a sign depicting an assault rifle, displaying it to those passing in cars, in front of the State Capitol, in Denver. When a gunman opened fire inside a packed movie theater in July of 2012, killing 12, it helped revive the national debate over gun control. But, as the trial of theater shooter James Holmes is scheduled to begin Monday, April 27, 2015, Colorados gun debate has quieted down. Its in a sort of gridlock, said nonpartisan Denver pollster Floyd Ciruli. (AP Photo/Brennan Linsley, file) (AP)