Can you buy a vote?  Of course you can.  Outside groups and individual donors have poured more than $45 million into Montana's U.S. Senate race as President Donald Trump prepares a third trip to the Big Sky state in his crusade to unseat two-term Democratic Sen. Jon Tester.

The contest is on pace to be the most expensive in Montana history, and it's been driven by Trump's apparent personal interest in Tester's defeat and his efforts to ensure Republicans keep power in the Senate.

Republican challenger and Trump loyalist Matt Rosendale is far behind in fundraising. But he's stayed competitive with $14 million spent by deep-pocketed conservative groups on his behalf, largely on ads attacking Tester on guns, immigration and taxes, according to an Associated Press review of spending reports.

Tester says it's a case of outside interests trying to influence Montana politics. But he also has out-of-state backers: Political committees representing conservation groups, hospitals and banks.

Remember absentee ballots have been mailed out so fill out yours.