Gelber soundly won the August 24, 2010 primary election, defeating his Democratic opponent fellow state senator Dave Aronberg by 18 points. His campaign has been endorsed by many top public servants, including Republican state senator J. Alex Villalobos, former United States Attorney General Janet Reno, former Florida Education Secretary Betty Castor, former Congressman Jim Davis, Congresswoman and DNC Vice Chair Debbie Wasserman Schultz and Tampa Mayor Pam Iorio, as well as the Florida Police Benevolent Association, the state's largest law enforcement union.