Michigan residents overwhelmingly passed a ballot measure last week intended to restrict the ability of utilities and state contractors to influence politics. Now, the utilities are fighting back.

In a lawsuit filed last Thursday, the two major utilities in Michigan, Consumers Energy and DTE, argue that the measure—dubbed Proposal 2—threatens their First and 14th Amendment rights.

The ballot measure, which passed with 81 percent of the vote, amends the state’s campaign finance laws to put restrictions on donations for both utilities and companies with more than $250,000 annually in state and local government contracts. The new language explicitly bans political donations from utilities, contractors, and high-level employees, lobbyists, and their immediate family members.…