FORT WORTH, Texas (AP) — Republican Sen. Ted Cruz, of Texas, sought to fend off an underdog challenge Tuesday from Democratic Rep. Colin Allred in one of the year's most expensive races, which is testing shifts in America's biggest red state and could factor into the fight for U.S. Senate control.

The race that could determine who controls the U.S. Senate. An Allred victory would give Texas its first Black senator and boost the Democrats' chances of maintaining their narrow Senate majority. Cruz winning would mean a third term for the incumbent Republican.

Every week, Eye on Politics breaks down some of the biggest political stories grabbing headlines in North Texas and beyond. This week, the focus is on election day on Tuesday, Nov. 5.