A Joaquin Castro candidacy instantly makes next year's Senate race competitive, observers say.
John Cornyn may be vulnerable and 2020 looks even better than 2018 for Democrats—but who will run?
Texas's senior U.S. senator says he will have to make the case for his re-election based on his positions, not those of the president.
Texas law would allow Beto to take a shot at the White House and at Senator John Cornyn at the same time.
The second ranking Republican expressed admiration for the Dallas diva following reports of her drug overdose and entering rehab.
Cornyn's tactics to get hurricane recovery money for Texas have angered two tea party groups.
Cornyn backs out of the FBI director race.