2012 United States Senate election in Indiana

2012 United States Senate election in Indiana

November 6, 2012
Turnout58.5%
 
Nominee Joe Donnelly Richard Mourdock Andy Horning
Party Democratic Republican Libertarian
Popular vote 1,281,181 1,133,621 145,282
Percentage 50.04% 44.28% 5.68%

Donnelly:      40–50%      50–60%      60–70%
Mourdock:      40–50%      50–60%      60–70%

U.S. senator before election

Richard Lugar
Republican

Elected U.S. Senator

Joe Donnelly
Democratic

The 2012 United States Senate election in Indiana took place on November 6, 2012, concurrently with the U.S. presidential election as well as other elections to the United States Senate and House of Representatives, and various state and local elections. Incumbent Republican U.S. Senator Richard Lugar ran for reelection to a seventh term, but was defeated in the primary by Tea Party-backed Richard Mourdock.

U.S. Representative Joe Donnelly, a Democrat from Indiana's 2nd congressional district, was unopposed in his party's primary, and then defeated both Mourdock and Libertarian Andrew Horning in the general election. As of 2025, this is the last time Democrats won any statewide election in Indiana, and the most recent Senate election in which an elected incumbent was defeated in the primary. It was also the last time until 2024 where the opposite party picked up a seat in a cycle after losing the previous one a cycle earlier.