For a quarter century, Texas Republicans have run a ruby-red state, building a conservative bastion where government is limited.

Now, the mounting tensions of racially motivated rhetoric, a polarizing president and Republican infighting have rocked Texas’s political leadership to its core. And the state may soon face a tipping point brought on by shifting coalitions of voters who want change, in Austin and Washington.

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The tumult is creating turnover that has startled even the closest observers of Texas politics. In just the last week, Reps. Kenny Marchant Kenny Ewell MarchantHouse Ethics panel recommends ,000 fine for Rep. Schweikert's campaign finance violations Candace Valenzuela wins Texas runoff to replace retiring Rep. Marchant Ethics Committee reviewing Rep. Sanford Bishop's campaign spending MORE (R), Pete Olson Peter (Pete) Graham OlsonShakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' The time for HELP is now: Senate should pass bill to expedite recovery following natural disasters House Democrats reserve airtime for voters of color in Texas MORE (R), Will Hurd William Ballard HurdHillicon Valley: Oracle confirms deal with TikTok to be 'trusted technology provider' | QAnon spreads across globe, shadowing COVID-19 | VA hit by data breach impacting 46,000 veterans House approves bill to secure internet-connected federal devices against cyber threats House Democrats' campaign arm reserves .6M in ads in competitive districts MORE (R) and Mike Conaway Kenneth (Mike) Michael ConawayBottom line House Republican introduces amendment to include farm aid in stopgap funding bill Live coverage: Democrats, Republicans seek to win PR battle in final House impeachment hearing MORE (R) have said they will retire rather than seek a new term in 2020.

The nation’s attention has been focused on Texas this week because of the killings of 22 people by a long shooter who attacked a Walmart in El Paso. The shootings were even more disturbing for a manifesto allegedly written by the accused shooter that described an “invasion” of immigrants.

So far, newcomers to Texas from blue states — states with stricter gun control laws, a stronger social safety net and a looser approach to immigrants — have been bigger change agents in the state than Hispanics, a large number of whom have tended to stay home on Election Day.

“In Texas, we have been waiting for what’s called a Pete Wilson moment for a quarter century,” said Cal Jillson, a political scientist at Southern Methodist University, referring to the former California governor who led the campaign to pass a controversial anti-immigrant law in 1994, setting the state on a trajectory toward its current liberal status. “A Pete Wilson moment that would awake the Hispanic electorate has never come.”

It's far from clear that the El Paso shooting — the fifth mass shooting in Texas in the last five years — will be that moment, though its potential for further roiling the state’s politics is obvious.

Meanwhile, population growth in Texas has given Democrats new opportunities.

The Texas miracle that three successive Republican governors have touted has attracted millions of new residents in search of jobs, and those newcomers, many of them from California, are shifting the state’s politics. One percent of the state of California, with a much more liberal population, has moved to Texas.

Four of the 10 American counties that have added the most new residents since 2010 are in Texas; four of the 10 counties adding residents at the fastest pace are there, too.

Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonFox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio Trump, Biden court Black business owners in final election sprint The power of incumbency: How Trump is using the Oval Office to win reelection MORE in 2016 won 569,000 more votes than Barack Obama Barack Hussein ObamaObama warns of a 'decade of unfair, partisan gerrymandering' in call to look at down-ballot races Quinnipiac polls show Trump leading Biden in Texas, deadlocked race in Ohio Poll: Trump opens up 6-point lead over Biden in Iowa MORE did in Texas in 2012; 568,000 of those votes came from the 20 largest counties in the state, Progress Texas found.

Trump won Texas’s electoral votes by a slimmer margin in 2016 than any Republican presidential nominee since Bob Dole in 1996, when Texan and Reform Party nominee Ross Perot was on the ballot.

“Under normal circumstances, Texas is still a red state. But normal circumstances are suspended so long as Trump is a part of our national politics, because he destabilizes everything,” Jillson said. “The natural progression of demographic change [is] accelerated by Trump destabilizing all of our national politics.”

The 2018 midterm elections, in which Democrats made inroads in fast-growing suburbs around Dallas, Austin, San Antonio and Houston, shook some in the GOP. Then-Rep. Beto O’Rourke (D) came within 3 percentage points of beating Sen. Ted Cruz Rafael (Ted) Edward CruzThe Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Cruz blocks amended resolution honoring Ginsburg over language about her dying wish Trump argues full Supreme Court needed to settle potential election disputes MORE (R) — and, crucially, O’Rourke won more raw votes than Hillary Clinton did in 2016.

“There’s the organization and motivation of Democrats finally getting their act together on the ground,” said Corbin Casteel, a longtime Republican strategist in Austin. “There’s the natural pendulum swing back toward the middle.”

There are signs that some Texas Republicans want to get out of the way, before change is forced upon them. Multiple sources say there are more retirements to come. Six other Texas Republicans won election in 2018 by margins of less than 10 percentage points.

Ironclad Republican control in Austin is at risk, too. Democrats once mired in a deep minority in the state House have gained 19 seats over the past two elections. They are now just nine seats away from gaining control of the 150-member chamber — and, critically, a seat at the redistricting table after the 2020 census.

In recent weeks, a conservative activist has rocked Austin with claims that he has a recording of the new House Speaker, Dennis Bonnen (R), urging him to target 10 incumbent Republicans in next year’s primary elections.

Bonnen, serving his first term as Speaker, has denied the allegations. The activist, Michael Quinn Sullivan, has not released the full tape.

“When you don’t have anyone to fight, you fight yourselves,” Casteel said.

The suburban women who handed Democrats control of Congress are key to the party’s hopes of capitalizing on the tumultuous moment in Texas politics, Jillson said.

“White suburban women are temporarily part of the Democratic coalition in Texas, but I wouldn’t think of them as firm, long-term members,” he said. “Those women are responding to Trump, but also to these mass shootings.”

But whether they are arriving in sufficient numbers to put the state in play remains to be seen.

“It’s not a purple state, but it’s trending the other way right now. Democrats still have to win something for it to be considered a purple state,” Casteel said.