2010Final results
2010 election for Iowa Senate District 21
Iowa State Senate · Iowa
Dennis H. Black (D) won with 52.2% of the vote, defeating Joe Pirillo (R) by 4.6 points.
Dennis H. BlackDemocrat · winner · incumbent
52.2%13,517
Joe PirilloRepublican
47.6%12,321
25,877 votes
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET
The seat over time
D − R margin in this seat's races around 2010
Races before and after
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET