Longtime Republican pollster Frank Luntz is warning the GOP that Texas has the “exact ingredient” for a potential Democratic upset in November’s election for a U.S. Senate seat.

“The assumption has been for the last 20, 25 years, that Texas is solidly Republican,” he told NewsNation’s Leland Vittert. “But the demographics have been changing.”

He said the state is becoming less white and Democrats are getting better organized. In addition, Democrats this year are seeing “incredibly high” turnout in special elections and primaries around the country.

In Texas, more than 2.2 million people voted in this week’s Democratic primary ― a midterm record for the state ― as state Rep. James Talarico defeated U.S. Rep. Jasmine Crockett.

“If you’re a Democrat, you can’t wait to vote,” Luntz said. “Every Democrat is looking to participate.