In the high-stakes race for a seat in the Montana Senate

It’s not just the presidency that will be decided on Election Day. Voters will also decide which party controls the Senate. Currently, the Democrats have a one-seat lead, but the party is defending 23 seats. The seat most at risk is that of Montana Democrat Jon Tester, who faces a stiff challenge from Republican Tim Sheehy. Here’s what you need to know about the race.