The campaign ad begins with a clear, idyllic stream that suddenly turns sludge-brown as two concrete datacenters slam on to its banks. Another facility thuds down on a peaceful suburban park, and two more crush-green pastures as an ominous soundtrack to a disaster movie blares.

“They’re coming for our rivers. Our neighborhoods. Our farmland,” a deep-voiced narrator says. “Because Brent Taylor wrote the law allowing datacenters to take over Tennessee.”

The attack ad, paid for by the Democrat-aligned Three Star Pac and targeting a Tennessee Republican congressional candidate, is one of more than 150 midterm election campaign commercials across the US focused on datacenters or the artificial intelligence industry.…