A Republican poll obtained exclusively by the Houston Chronicle show Cornyn is down against Texas Attorney General Ken Paxton among likely GOP primary voters by 17 percentage points. A Democratic poll shows him down more than 20 percentage points. State Sen. Paul Bettencourt, R-Houston, said it’s time for someone to have a serious talk with Cornyn about whether he really wants to go through with another campaign that could quickly turn negative and costly. “If I was an incumbent senator with these types of polling numbers, I probably wouldn’t run because you can’t win,” Bettencourt said. Cornyn has said he's...