DALLAS - Primary election day in Texas is Tuesday with voters headed to the polls to determine the Democratic and Republican candidates for the November general election.
Voters will choose several federal, state and local offices this election.
Here are some of the key races across the state to keep an eye on Tuesday night.
Democrats and Republicans find themselves in contentious races for their party's nomination for the U.S. Senate seat currently held by Sen. John Cornyn. The primary is the most expensive U.S. Senate primary in history, with political advertising spend topping $128 million, according to AdImpact.
On the Republican side, Cornyn faces a challenge from Texas Attorney General Ken Paxton and Rep. Wesley Hunt.
Polls show the race is neck and neck between Cornyn and Paxton and the race is could end up in a May runoff election between the top two votegetters Tuesday night.
On the Democrat side, state Rep. James Talarico and Congresswoman Jasmine Crockett have flip-flopped the lead in the race depending on when a poll is released.
Democratic voters have shown up for early voting during the primaries, outpacing their Republican counterparts.
Regardless of which candidate earns the nomination Tuesday night, Democratic voters are wondering if the winning candidate can become the first Democrat to win a statewide election in Texas since 1998.
In the race to replace Paxton as the state's attorney general, the Republican race is another that has the potential to head toa runoff.
Polls show Rep. Chip Roy with a lead over state Sen. Mayes Middleton, state Sen. Joan Huffman and Aaron Reitz, a former assistant AG for the U.S. DOJ's Office of Legal Policy.
The race to control the state's money is packed on the Republican side.
Former state Sen. Don Huffines was leading the race in recent polls, followed by Railroad Commissioner Christi Craddick and acting comptroller Kelly Hancock. Hancock has the endorsement of Gov. Greg Abbott.
Another Republican primary for state office that's been highly publicized is the race for agriculture commissioner.
Current commissioner Sid Miller is leading in the polls as he seeks reelection, but is facing a challenge from Texas honey farmer Nate Sheets.
All 38 seats in the U.S. House of Representatives will be up for grabs in November and several potential candidates find themselves in heated contests for their party's nomination.
Several Texas representatives are retiring at the end of their term and others are leaving to pursue other offices. The uncertainty in those districts combined with a rare mid-decade redistricting have left doors open as Republicans look to add to their shallow majority in Washington.
Polls are open across the state from 7 a.m. to 7 p.m. Once the polls close for the day, official counts will begin to decide winners.