Opponents of a Tennessee proposal protecting teachers who allow students to criticize evolution and other scientific theories like global warming are urging Governor Bill Haslam to veto the measure. Several opponents of the legislation delivered a petition containing more than 3,000 signatures to Haslam spokesman David Smith outside the governor's office Thursday. Smith told those who brought the petition he would make sure the governor got it. Haslam says he’ll sign the proposal, which he says encourages critical thinking by protecting teachers from discipline if they help students critique what he calls "scientific weaknesses." Scientists in Tennessee and the American Association for the Advancement of Science say evolution is established science that shouldn't be taught as a controversy.