2010Final results
2010 election for U.S. Senate in Iowa
U.S. Senate · Iowa
Chuck Grassley (R) won with 64.4% of the vote, defeating Roxanne Conlin (D) by 31.0 points.
Chuck GrassleyRepublican · winner
64.4%718,215
Roxanne ConlinDemocrat
33.3%371,686
John HeiderscheitLibertarian
2.3%25,290
1,116,063 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 2010
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.
Roxanne ConlinChuck Grassley
$3.2M
Raised by the campaign
$5.8M
$3.1M
Spent by the campaign
$6.7M
$28.8K
Cash on hand
$1.9M
Campaign money: FEC, through Dec 31, 2010.
Source: FEC campaign filingsUpdated Dec 31, 2010