Sen. Jon Tester's campaign spent over $19,000 on high-end restaurants in Washington, D.C., as well as thousands more in Washington state, Illinois and Montana.
The GOP is eyeing eight seats currently held by Senate Democrats in 2024 West Virginia, Ohio, Montana, Michigan, Wisconsin, Pennsylvania, Arizona and Nevada.
Republicans appear to be in a strong position to take back control of the Senate in 2024, where they only need to flip two seats, with numerous vulnerable Democrats set to appear on the ballot amid a contentious presidential election.