2012Final results

2012 election for U.S. Senate in Montana

Name: 2012 election for U.S. Senate in Montana
Start: 2012-11-06
Location: Montana

U.S. Senate · Montana

Jon Tester (D) won with 48.6% of the vote, defeating Denny Rehberg (R) by 3.7 points.

Jon TesterDemocrat · winner

48.6%236,123

44.9%218,051

Dan CoxLibertarian

6.6%31,892

486,066 votes

Source: MIT Election Data and Science LabUpdated Sep 30, 2026, 7:25 AM ET

The seat over time

D − R margin in this seat's races around 2012

Source: MIT Election Data and Science LabUpdated Sep 30, 2026, 7:25 AM ET

Each line compares the two campaigns on one scale.

Jon TesterDenny Rehberg

$11.9M

Raised by the campaign

$9.6M

$12.4M

Spent by the campaign

$9.5M

$59.8K

Cash on hand

$33.7K

Campaign money: FEC, through Dec 31, 2012.

Source: FEC campaign filingsUpdated Dec 31, 2012