Texas Rep. Steve Stockman participates in a mock swearing-in ceremony with House Speaker John Boehner in January. Stockman made the surprise move to challenge Sen. John Cornyn in the 2014 Texas GOP primary. Evan Vucci/AP hide caption toggle caption Evan Vucci/AP It's All Politics Conservative Firebrand Challenges Texas GOP Sen. John Cornyn December 10, 2013 The No. 2 Republican in the Senate is the latest GOP incumbent to receive a challenge from the right. In a surprise move, Rep. Steve Stockman, who has a knack for stirring controversy, entered the 2014 Senate race Monday just before the state's filing deadline.