Incumbent Republican Sen. Ted Cruz and Democratic challenger Colin Allred's Senate race is among the most closely watched this election cycle.

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.

One of the most closely watched races in the Lone State State is the Senate race between Ted Cruz and Colin Allred. Cruz is seeking his third term in the US Senate. Allred, a Dallas Congressman and former NFL linebacker, is looking to flip a red seat for the second time in his political career.