The new poll found that 41 percent of Americans would oppose a data center being built within three miles of where they live, up from 28 percent in the January survey. The number supporting those projects dropped during the same period, from 37 percent to 24 percent.

The shift was especially pronounced among people who said they had voted for Kamala Harris in the 2024 presidential race.

The results reflect the scope of the challenge facing the industry and its supporters as the rapid buildout of data centers brings the issue home to voters ahead of the November midterms. More than 200 data centers are going up in dozens of competitive House districts, a recent POLITICO analysis found.

“It’s rare to see political attitudes change this fast in an era where they are often quite static and partisan,” said Seb Wride, head of polling at Public First.