The incumbent Cornyn, seeking a fifth term in Washington, drew primary challenges from the Texas AG Paxton and Houston Congressman Wesley Hunt.

Multiple statewide and county-level primary races are heading to runoff elections in May.

From voter turnout to who Texas' U.S. Senate candidates will be, here's what voters should be keeping an eye on amid Tuesday's party primary elections.

The changes, adopted last April and last December, could add at least a day to the time between when a mail-in ballot is sent and when it receives the postmark needed to be legally admissible.