John Cornyn, a four-term U.S. Senator from Texas, is facing significant challenges in the race for the Republican nomination. A recent poll conducted by a Paxton-allied super PAC shows that Texas Attorney General Ken Paxton has a commanding 19-point lead over Cornyn in a head-to-head matchup of Republican primary voters. The poll, released by Pulse Research, indicates that Paxton has 57% support among primary voters, while Cornyn holds 38%.