Nebraska's governor's primary race pits Trump-backed candidate accused of sexual misconduct against two other Republicans

Voters in Nebraska and West Virginia head to the polls on Tuesday, to cast ballots in primary elections that will once again test former President Donald Trump's influence over Republican primary voters.

Trump has endorsed candidates in several races, including the highest-profile contests to be the GOP nominee in the race to be Nebraska's next governor and a matchup between two incumbents for a West Virginia congressional seat. 

Here are the key races to watch on Tuesday night: