SENATE

Montana Senate2018

RACE AT A GLANCE

SEAT HELD

Jon Tester

RACE WINNER

Jon Tester

Seat held

RACE TYPE

Incumbent running

Jon Tester (D)

RACE RATING

Last updated: Oct 4, 2018
Lean D
Toss Up

Key Dates

Filing Deadline: TBD

Primary Election: TBD

INCUMBENT

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INCUMBENT

Jon Tester

First Elected: 2006

Last General Election: 48.6%

Last Primary Election: -

Full Bio:
TESTER, Jon, a Senator from Montana; born in Havre, Mont., on August 21, 1956; graduated College of Great Falls 1978, farmer; teacher; member, Big Sandy school board 1983-1992 (chairman 1986-1991); Montana State senate 1999-2006, serving as minority whip 2001-2003, minority leader 2003-2005, president 2005-2006; elected as a Democrat to the United States Senate in 2006 for the term commencing January 3, 2007; reelected in 2012 for the term ending January 3, 2019; chair, Committee on Indian Affairs (One Hundred Thirteenth Congress [February 12, 2014-January 3, 2015]); chair, Democratic Senatorial Campaign Committee (2015-2017).

Source: Bioguide

CANDIDATES

Republicans

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Independents / Other Parties

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STATE DATA

Montana

 

Population Breakdown

Source: American Community Survey

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    xx.x%
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    xx.x%
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    xx.x%
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    xx.xx%

Past Presidential Results from this State

2016 Election Results

Source: The Cook Political Report/POLIDATA

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    xx.x%
    xx votes
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    xx.x%
    xx votes

2012 Election Results

Source: The Cook Political Report/POLIDATA

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    xx.x%
    xx votes
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    xx.x%
    xx votes

RACE ANALYSIS

The Bottom Line

Updated: Oct 4, 2018

There was a time over the summer when it appeared that Democratic U.S. Sen. Jon Tester would cruise to re-election.  Republicans hosted a contentious primary in June that State Auditor Matt Rosendale won with 34 percent to 28 for former Yellowstone County District Judge Russell Fagg, and 19 percent each for USAF veteran and storage company CEO Troy Downing and state Sen. Albert Olszewski.  While Republicans seemed to struggle to unite around Rosendale, Democrats launched a relentless round of attacks, labeling Rosendale as a carpetbagger, dubbing him “Maryland Matt,” and accusing him of wanting to develop public lands.  But, even as it looked as if Rosendale had been backed into a corner, the polls began to close, and is now a race that’s within the margin of error, though continues Tester has been ahead in every public poll to date.  Democrats acknowledge that the race has closed, but point out that Tester has some structural advantages that will all but assure his victory in November. 

As his campaign and his Democratic allies continue to attack Rosendale, Tester has stressed his ability to work across party lines, boasting that President Trump has signed 20 bills that he had co-sponsored. He has also focused on his promise to always act in Montana’s best interest.  Republicans, though, have accused Tester of breaking many of the promises he made when he was first elected, particularly with regard to accepting contributions from lobbyists, missed important committee hearings, and voting against President Trump’s priorities.  They argue that he isn’t the populist he claims to be, noting that he votes with Democrats 90 percent of the time.

Beyond what they say are Rosendale’s vulnerabilities, Democratic strategists point out that Tester and his allies are dominating Rosendale and Republicans on television; they currently have a three to one advantage in gross rating points.  Early voting starts next week; leaving Republicans little time to make their case against the incumbent.  Rosendale also has to deal with a Libertarian candidate on the ballot; Libertarians have denied more than one Republican nominee statewide office.  In the 2012 Senate race, a Libertarian took nearly 7 percent of the vote, while Republican Denny Rehberg got 45 percent.  Tester won the race with just under 49 percent.  Absent the Libertarian, Rehberg would have won the contest, 51 percent to 49 percent.

So why has the race closed?  Largely it’s a matter of Republicans coming home in a state Trump carried by 20 points.  The ongoing saga over Brett Kavanaugh’s Supreme Court nomination is also galvanizing the base as Republicans remind voters that Tester voted against Neil Gorsuch, Trump’s first nominee, and has already stated that he will vote against Kavanaugh. 

While the race is moving to Toss Up based on both public and private polling showing the contest within the margin of error, we’ll put a thumb on the scale for Tester.  

Race Analysis

Updated: Jun 23, 2026

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