Montana's Senate elections have the largest ad spending per voter by far as Republican Sheehy leads

Political spending per voter in Montana has been by far the highest this election season, with both parties spending over $120 between January last year and all the way through November 5.

Several races across the country have received close attention as control of the Senate is expected to be decided by just a few seats. In Montana, Democrats have spent over $150 per voter this cycle, according to Axios.

This compares to some $38 per voter in Nevada and less than $20 in Ohio, the two closest contenders. The figure is not only set to be the largest in the election cycle but also in history.

As for Republicans, spending is almost at $129 per voter in the state, compared to just over $24 in Ohio and $20.56 in Nevada. Despite Democrats' larger spending, incumbent Jon Tester has been trailing challenger Tim Sheehy in most recent polls.

According to FiveThirtyEight's aggregator, the latest survey, conducted by Fabrizio Ward/David Binder Research and AARP among 600 likely voters in late August, Sheehy is ahead with 51% of the support, compared to Tester's 45%.

Previous polls conducted earlier last month also show the Democrat trailing, with one outlier by RMG Research and the Napolitan Institute among 540 registered voters that has him on the lead 49% to 45%.

The Cook Political Report changed the race from "toss up" to "lean Republican" on Thursday, but Democratic Senatorial Congressional Committee Chairman Gary Peters said the state's rural nature and population growth makes it difficult to poll accurately. "You can see polls bounce around quite a bit," he told Axios.

Tester has been running a state-focused campaign, keeping Kamala Harris' at arms' length and even refused to endorse her. Texas candidate Colin Allred has taken a similar stance in Texas, although he did endorse Harris and went to the Democratic National Convention along with others in contested races.