2010Final results
2010 election for Iowa's 3rd District
U.S. House · Iowa
Leonard L. Boswell (D) won with 50.7% of the vote, defeating Brad Zaun (R) by 4.2 points.
Leonard L. BoswellDemocrat · winner
50.7%122,147
Brad ZaunRepublican
46.5%111,925
Rebecca WilliamsonSocialist Workers
2.6%6,258
240,756 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.
Leonard L. BoswellBrad Zaun
$1.5M
Raised by the campaign
$682.8K
$1.6M
Spent by the campaign
$681.9K
$65.3K
Cash on hand
$891
Campaign money: FEC, through Dec 31, 2010.
Source: FEC campaign filingsUpdated Dec 31, 2010