Update: 11:30 p.m.
In a race getting national attention, Republican U-S Senator Ted Cruz and Democrat Beto O'Rourke appear to be on their way to easy wins in their respective primaries. They will face each other for Cruz's seat in the November general election.
Gov. Greg Abbott is coasting to re-nomination, earning nearly 90 percent support among Republicans ... the same for Lt. Gov. Dan Patrick, with 76 percent support.
Also, Land Commissioner George P. Bush and Ag Commisioner Sid Miller got some healthy in-party challenges, but locked up victories.
Meanwhile, among Democrats, Lupe Valdez, Andrew White appear headed to a gubernatorial runoff to challenge Gov. Abbott in November.
In Congressional races:
--The 2nd District House seat is being vacated by Ted Poe ... and it appears that Kevin Roberts and Kathaleen Wall are headed for a runoff for the Republican spot on the November ballot.
--Congressman John Culberson drew 77 percent of the House 7 vote, easily turning away an in-party challenge. Democrats, however, are targeting his seat as one they can flip.
Update: 9:15 p.m.
Incumbent Republicans in statewide office all have leads -- some of them substantial -- as early-voting totals are released.
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Update: 7:30 p.m.
With 1 percent of the statewide vote counted, Land Commissioner George P. Bush leads predecessor Jerry Patterson, 55 percent, to 33 percent. While the vote total is early, it will be among the most closely watched races in Texas tonight.
Miguel Suazo is the early leader among Democrats.
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Update: 7 p.m.
The vote count is under way.
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The polls have closed in Greater Houston and statewide, where voters headed to the polls for Tuesday's primary -- the nation's first midyear primary in the Trump era.
The big race in the Houston area is the GOP and Democratic primaries to replace retiring Congressman Ted Poe. There are nine Republicans running in the primary, while five Democrats are hoping to get the nod.
There's also the District 134 GOP primary between incumbent Sarah Davis and challenger Susanna Dokupil.
Gov. Greg Abbott waded his way into the primary, endorsing Dokupil, while Davis has the support of the Texas House Republican Caucus.
Other notable races on the ballot include the GOP primary for Texas Land Commissioner between incumbent George P. Bush and former Commissioner Jerry Patterson.
Democrats are picking who will be their governor's nominee between nine candidates on the ballot, including former Dallas County Sheriff Lupe Valdez and Andrew White, the son of former Governor Mark White.
Polls closed at 7 p.m.