Thune endorses Cornyn ahead of what could be a thorny primary

Politico.com - For more and to sign up click here Sen. John Cornyn (R-Texas) is gearing up for perhaps the most difficult election battle of his long career, securing an early endorsement from Senate Majority Leader John Thune on Wednesday, his one-time opponent in the fight for the chamber’s top job. “I’ve been honored to work alongside @JohnCornyn—one of the most effective and respected conservative leaders in…