Here's what to watch for in the Texas primary runoff election today

Key Points:

• The historic and most expensive Texas Senate GOP primary runoff between incumbent Sen. John Cornyn and Attorney General Ken Paxton concludes Tuesday, with Trump's recent endorsement of Paxton significantly impacting the race.
• Other key runoffs include Democratic incumbents Christian Menefee and Al Green in the 18th Congressional District, and a contentious Democratic primary in the 35th District where Maureen Galindo faces criticism over antisemitic remarks.
• The 33rd District Democratic runoff pits incumbent Rep. Julie Johnson against former Rep. Colin Allred in a newly redrawn, less Democratic district, while the Republican runoff features Patrick David Gillespie and John Sims.
• The Texas attorney general race features a Republican runoff between U.S. Rep. Chip Roy and state Sen. Mayes Middleton, with Middleton leading in polls and backed by Lt. Gov. Dan Patrick, while Democrats Nathan Johnson and Joe Jaworski face off.
• The Texas Railroad Commissioner Republican runoff is between incumbent Jim Wright and Bo French, whose controversial statements have drawn criticism and split GOP support, with Wright backed by top state officials and French appealing more to Paxton voters.