Four states hold primaries Tuesday: Alabama, Arkansas, Georgia and Texas, where there are runoff races following an election on March 1.

There are runoffs for both Democrats and Republicans in Texas' 28th Congressional District. For Democrats, there's a highly contested race between incumbent Rep. Henry Cuellar and progressive challenger Jessica Cisneros. And for Republicans, Cassy Garcia, a former staffer for Sen. Ted Cruz, is up against Sandra Whitten, who has previously run against Cuellar in the general election.

There's also a GOP primary runoff for attorney general that pits incumbent Ken Paxton against George P. Bush, nephew of former President George W. Bush and the state's land commissioner.

Final polls close in Texas at 9 p.m. ET.

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