Only around a million people live in Montana, but the state will likely determine the balance of power in the U.S. Senate.

Montana Senator Jon Tester’s campaign merch is diverse, personable, and designed to fundraise in a close contest.

MSNBC's Lawrence O'Donnell is joined by Montana Democratic Sen. Jon Tester to discuss how the issue of reproductive rights, ...

The Montana Supreme Court on Tuesday affirmed a lower court ruling that allowed the state’s Green Party Senate candidate to ...

A Green Party candidate for the U.S. Senate must be included on the state's ballot for the Nov. 5 election, the Montana's ...

The Montana Supreme Court ruled that a third-party Senate candidate can remain on the November ballot, rejecting the state's ...

Jon Tester is casting doubt on a recent poll that served as a precursor for political handicappers to give Republicans the ...

Republicans are calling on their Democrat colleagues to vote on several border-focused bills to test their commitment to ...

Republicans are feeling better and better about their chances of knocking off Sen. Jon Tester (D) in Montana’s hotly ...

I’m retired, but during my work years I had the privilege of working with Jon Tester for over two decades on important ...

A dour outlook on the race in a Trump-dominated state raises questions whether Democrats should put resources elsewhere, a move they say is out of the question.

If Kamala Harris defeats Donald Trump and wins the presidency, she may still face a Republican Senate that could block her nominees and agenda.