[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2009/images/07/22/thune.john.getty.art.jpg caption="Sen. John Thune (R-SD) listens during a news conference on Capitol Hill February 26, 2009 in Washington, DC."] From CNN's Carol Costello and Ronni Berke The Senate is poised to vote Wednesday on its third piece of gun rights legislation this year – and gun control advocates are racing to shore up … Continue reading Allow concealed weapons across state lines?