Democrats are coordinating attacks portraying data centers as beneficiaries of corporate tax breaks and political self-dealing that raise electricity costs and strain local water supplies and power grids. The House Democrats' campaign arm directed allied super PACs toward the issue in 11 battleground races, while the House Majority PAC tested negative messages in 24 districts; more than 40 ads across two dozen races have linked the projects to nearly $70 billion in tax breaks for big tech companies under the GOP's One Big Beautiful Bill Act. Public opposition has increased: a July POLITICO Poll found 41% opposed a data center within three miles of their home and 24% supported one, compared with 28% opposed and 37% supportive in January. A new NBC poll found data centers broadly unpopular across party lines, while 70% of respondents were more worried than excited about artificial intelligence and 52% said they used AI tools very often or sometimes. President Donald Trump's support for expansion, including plans to ease Environmental Protection Agency rules, has complicated Republican candidates' responses, and the National Republican Senatorial Committee warned AI companies that the issue could threaten Republicans' effort to retain a Senate seat in Ohio.