The narrow margins and high numbers of undecided voters make this primary a crucial battleground for Republicans.

Steve Sarkisian and the Texas Longhorns earned a signature win to end the regular season, a 27-17 triumph over previously-unbeaten Texas A&M. That rivalry result sparked a multi-spot rise in Sunday's Week 15 Coaches Poll. Now slotted at No. 14 with the Aggies sliding to No. 7, Texas awaits its College Football Playoff fate as a bubble team.

The redistricting plan was pushed by President Donald Trump. A lower-court ruling had said that the map likely discriminates on the basis of race.