These are the key races to watch in the Texas primary runoff election on Tuesday

Texas voters return to the polls Tuesday to make final choices in a handful of two-candidate runoffs in races that had no clear winner in the March 1 primaries.

Polls will be open from 7 a.m. to 7 p.m. If you voted in the Republican or Democratic primary three months ago, you have to vote in the same party's runoff, but first-time primary voters can cast a ballot in either party's runoff.

Texas attorney general: Ken Paxton faces off against George P. Bush

A dust-up for attorney general: The Republican runoff has been relentlessly nasty, with incumbent Ken Paxton portraying his opponent as an insufficiently conservative and overly privileged member of a family political dynasty, and Land Commissioner George P. Bush painting Paxton as an unethical "swamp creature" beset by legal problems, including an FBI investigation into allegations of misusing his office.

More: George P. Bush rips Ken Paxton for running 'Biden-style' campaign in exclusive interview

The Democratic runoff is a far more civil contest between Brownsville lawyer Rochelle Garza, formerly with the ACLU of Texas, and Joe Jaworski, former Galveston mayor and grandson of Watergate special prosecutor Leon Jaworski.

More: George P. Bush draws support from Eva Guzman donors, outraises opponent Ken Paxton

Texas Railroad Commission

Brash outsider vs. well-heeled incumbent: The GOP runoff for Texas Railroad Commission pits incumbent Wayne Christian, a self-described "pro-oil-and-gas conservative," against Sarah Stogner, an oil and gas lawyer who stretched her campaign's limited dollars by focusing on social media, including an attention-grabbing video of her riding a pumpjack wearing little in the way of clothing.

Texas House districts

GOP in the House: Republican voters will choose nominees for three area Texas House districts that were redrawn last year to favor the GOP. U.S. Sen Ted Cruz, R-Texas, and Gov. Greg Abbott have split endorsements in the races:

• Austin police officer Justin Berry (Abbott) faces former Austin City Council Member Ellen Troxclair (Cruz) in a district stretching from western Travis County to Burnet, Blanco, Kendall and Gillespie counties.

• Barron Casteel (Abbott), former mayor of New Braunfels, faces nonprofit executive Carrie Isaac (Cruz) in a district that includes Comal County and eastern Hays County.

• Caroline Harris (Abbott), a policy adviser at the Legislature, faces software engineer Patrick McGuinness (Cruz) in a Williamson County district.

This article originally appeared on Austin American-Statesman: Texas voting 2022: Key races to watch for the primary runoff