While he easily won his party's senate primary with almost 62 percent of the Democratic vote and his mostly Hispanic El Paso district by more than 90 percent, O'Rourke struggled in certain regions, particularly the Rio Grande Valley.
"It is true that the extreme left is angry and energized and they hate the president", Cruz said on Tuesday's conference call. Still Mr. Cruz said he isn't taking anything for granted.
"We kept hearing about this unprecedented Democrat turnout in Texas and the Republicans showed up in droves yesterday", said RNC Chair Ronna McDaniel.
At least three Democratic primary runoffs will pit women candidates against each other. "We're seeing that in turnout".
More than 1.5 million people voted Tuesday in the GOP primary for U.S. Senate, won by incumbent Ted Cruz.
Should Republicans be anxious about losing more ground to Democrats?
"It's clear Texas Democrats are fired up, exceeding expectations, and charging forward to November", Texas Democratic Party chairman Gilberto Hinojosa said. So Republican Gov. Greg Abbott will face either Lupe Valdez, who was Texas' first Hispanic, lesbian sheriff, or Andrew White, who opposes abortion and whose father, Mark, was governor in the 1980s.
In 2016, some polls gave Democrats hope of a Hillary Clinton upset victory in Texas as part of a resounding electoral college victory for her in the general election. Pete Sessions, Will Hurd and John Culberson come November.
Democrats believe they have a chance to flip the seats now held by Reps.
O'Rourke could have a challenge in Texas, though, when it comes to Second Amendment rights.
Texas has a record eight open congressional races this year, including two now held by entrenched Republicans who opted against re-election amid scandal.
The victor of the primary is set to face off against Mr. Culberson, and Republicans are counting on a bruising primary fight over the next two months to hinder Democrats' chances.
The Dallas Morning News headlines: "In Texas primary, the "red riot" eclipsed the 'blue wave'".
Jim Dean, chair of Democracy for America, said Democrats can win if they nominate candidates cut from the same cloth as Mrs. Moser and Ms. Jones. O'Rourke talks to Rachel Martin following Tuesday's primary in the Lone Star State.