2012Flipped from RepublicanFinal results
2012 election for U.S. Senate in Indiana
U.S. Senate · Indiana
Joe Donnelly (D) won with 50.0% of the vote, defeating Richard E. Mourdock (R) by 5.8 points, a seat Republicans won last time.
Joe DonnellyDemocrat · winner
50.0%1,281,181
Richard E. MourdockRepublican
44.3%1,133,621
Andrew ??andy?? HorningLibertarian
5.7%145,282
2,560,102 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
Races before and after
Source: MIT Election Data and Science LabUpdated Sep 30, 2026, 7:25 AM ET
Money in this race
Each line compares the two campaigns on one scale.
Joe DonnellyRichard E. Mourdock
$5.7M
Raised by the campaign
$7.3M
$5.6M
Spent by the campaign
$7.9M
$93.9K
Cash on hand
$27.8K
Other candidates' campaigns: Andrew ??andy?? Horning $4.9K.
Campaign money: FEC, through Dec 31, 2012.
Source: FEC campaign filingsUpdated Dec 31, 2012