Cruz won again, NBC News projects, after another expensive challenge from a Democratic member of the House of Representatives.

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.

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