Montana emerges as biggest Senate ad spending target in battle for Tester's seat

The Senate ad wars in Big Sky Country are raging, with both Democrats and Republicans funneling millions to blanket the airwaves in Montana, a state critical to achieving a majority in the upper chamber.

Outside groups have already made early ad reservations in Montana, where Sen. Jon Tester (D-MT) is facing what could be his most difficult reelection campaign yet, in a state former President Donald Trump easily won twice. So far, Montana has seen $89.4 million in ad spending from groups on both sides of the aisle, the most of any state, according to a report from AdImpact. Nevada takes second place in ad spending but only saw half as much with $35 million.