Just days after Democratic Gov. Janet Mills announced her campaign for the U.S. Senate, she unwittingly appeared in an ad expressing appreciation for the person she hopes to unseat next November, Republican Sen. Susan Collins.

The ad , broadcast on local TV stations and digital platforms, was part of a $1 million “issue advocacy” campaign by the group One Nation and designed to cast Collins as a senator with the clout to deliver for Maine. The nonprofit spends millions of dollars promoting Senate Republicans who are “ delivering President Trump’s agenda .” It’s not required to disclose its donors.

Senate Democrats have their own dark money counterpart, Majority Forward, which has been running ads against Collins for the past several months.

One Nation and Majority Forward combined

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