President Donald Trump, speaking alongside cryptocurrency leaders at the White House this week, delivered a full-throated defense of data centers that Republican and Democratic candidates in competitive midterm races have largely refused to make.

“If I were the mayor of a town or the governor of a state, and I had a chance to get a big plant in, an AI plant or a data center,” Trump said, “I would absolutely want it because the jobs are enormous and the money paid, the taxes paid, are just enormous.”

It is not the kind of message any candidate is deploying on the trail this year, even as data centers are becoming a more visible part of local politics in battleground states.

The race to build data centers, which power artificial intelligence and cloud computing, has run aground amid frustration from voters who do not want to live near the massive warehouse campuses. Even the Senate Republicans’ campaign arm has warned that anger over data centers — some of which dwarf football stadiums and use more energy than small cities — could cost the party a seat.

Opposition stretches across the political spectrum, fueled by fears that the behemoths will jack up electricity bills, drain people’s water wells, create unhealthy amounts of air and noise pollution, and forever change a community’s character — all while receiving lucrative tax breaks from states competing for their business.

Trump has framed data centers as a necessary component of a top national and economic security priority: winning the AI race against China. At the same time, he has acknowledged concern over rising electricity bills, previously saying “it’s only fair” for the companies to shoulder their costs.

He also suggested this week that data centers need “a little public relations help.” In recent months, he has gotten tech giants to sign a voluntary pledge to shield U.S. consumers from higher utility bills, even as he pushes to streamline the process for companies and utilities to build their own power plants.

But building power plants does not happen overnight, and the immediate political reality for candidates across the country is far different. The gap between the White House’s economic pitch and campaign-trail caution reflects how quickly the issue has moved from a technology story to a local one, where energy use, water demand and tax incentives can matter more than the promise of high-tech investment.

“It is yet another dimension in which the White House appears tone deaf — tone deaf at best and indifferent to the interest of other Republican candidates at worst,” said James Henson, director of the Texas Politics Project at the University of Texas, Austin, a nonpartisan research organization.

Statewide candidates from Nevada to Pennsylvania, both Republican and Democratic, are weaponizing data centers against their opponents — and the candidates absorbing those attacks are subsequently trying to distance themselves from them.

Ohio

Ohio, a data center hot spot with closely contested races for governor and U.S. Senate, shows how sharply the politics have shifted. The National Republican Senatorial Committee warned in a memo Tuesday that Sen. Jon Husted is vulnerable to losing his seat because of the centers.

Democratic nominee Sherrod Brown is airing attack ads against Husted that call him the “face of data centers in Ohio” as people gather signatures for a statewide referendum to ban their construction.

The Republican memo called it a “sleeper issue for the entire election cycle.”

“Brown is using it because it works,” the NRSC said. “More than any other thing in this race, data centers are the anchor hanging around Husted’s neck. If he loses and data centers get the blame, politicians across the country will take notice — and they will not go near the next one.”

The memo suggested voters may balk at Democratic candidates who want to stop data center construction altogether, in favor of a Republican candidate who wants data centers built only if a community approves them in a local vote and they pay for their own power, water, and other utilities.

The polling picture

Most registered voters oppose building a data center in their area, according to a July Fox News poll. Still, the issue falls behind other voter concerns, such as the cost of living, as November looms.

A Quinnipiac Poll conducted in June asked voters what issues were important in deciding who to vote for in U.S. House elections, and about 4 in 10 mentioned AI data centers.

Nevada

In Nevada, Democrat Aaron Ford quickly tied Trump’s statement to Republican Gov. Joe Lombardo, characterizing the two as being in “lockstep on data centers.”

In a statement, Ford said Trump and Lombardo are “Nevada data centers’ biggest cheerleaders” who “only care about catering to their ‘billionaire friends’ while Nevadans pay the price.”

Ford this week unveiled a policy platform in which he said he would halt new state tax breaks for data centers — which he estimated at $200 million currently — while auditing existing projects to ensure they are delivering on their promises. He also said he would ensure data centers pay for their electricity needs, do not deplete Nevada’s water supply, and help local governments negotiate strong benefits agreements with developers.

Texas

Texas Gov. Greg Abbott, who last November celebrated Google’s announcement of a $40 billion investment there by calling the state “the epicenter of AI development,” is under attack from his Democratic challenger, Gina Hinojosa, over his pursuit of data center development.

Abbott has since changed course, promising tougher action such as removing the state’s sales tax exemption and holding up projects to review their energy usage.

Trump criticized the shift, saying “I think it’s a mistake” in a recent interview with Punchbowl News.

Asked about Trump’s support for data centers, Abbott’s office said the governor’s “top priority is to protect Texans’ safety and quality of life and ensure the integrity of our power grid and water supply.”

“Simply put, Texans must come first,” Abbott’s office said.

Wisconsin

While Trump embraces data centers, even some of his allies are using them for political attacks. U.S. Rep. Tom Tiffany, running for Wisconsin governor, released a TV ad this week branding his Democratic opponent as “Data Center David Crowley.”

The ad includes a clip of Crowley saying Wisconsin could become the “AI and data hub not only for the entire country, but for the entire globe.”

Crowley has said local communities must have veto authority, while also calling data centers a part of the modern economy that could bring significant economic benefits to the state.

Tiffany, whom Trump has endorsed, has also said positive things about data centers. In January, Tiffany called data centers “exciting new technology” in an interview with PBS Wisconsin. Last December, he voted for a bipartisan bill known as the SPEED Act, which is designed to accelerate construction of new AI infrastructure projects like data centers. It has not passed the Senate.

Neither Tiffany nor Crowley supports a moratorium on new data center construction. Tiffany has called for repealing the state tax incentive for data centers, while Crowley has not. Both have called for stricter regulation.

Crowley, at an event Wednesday where he received the endorsement of the environmental group Clean Wisconsin, downplayed the attacks Tiffany has made against his data center position.

“He’s getting very good at saying one thing and doing something different,” Crowley said, pointing to Tiffany’s votes in support of the SPEED Act.

“What Congressman Tom Tiffany’s doing is lying because he’s trying to run away from his record in Congress,” Crowley said.

Bauer reported from Madison, Wisconsin, and Levy from Harrisburg, Pennsylvania. Linley Sanders contributed from Washington.

This story was originally featured on Fortune.com.