2010Final resultsSpecial election
2010 special election for Pennsylvania's 12th District
U.S. House · Pennsylvania
Mark S. Critz (D) won with 52.6% of the vote, defeating Tim Burns (R) by 7.5 points.
Mark S. CritzDemocrat · winner
52.6%70,915
Tim BurnsRepublican
45.1%60,740
Demo AgorisLibertarian
2.3%3,158
134,813 votes
Source: Federal Election CommissionUpdated Oct 3, 2026, 3:20 AM ET
The seat over time
D − R margin in this seat's races around 2010
Races before and after
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)
Polls against the result
- Poll with Critz ahead
- Poll with Burns ahead
- Result
| Pollster | Dates | Sample | Critz | Burns | Margin | Adjusted | Miss vs result | Grade | Release |
|---|---|---|---|---|---|---|---|---|---|
| Public Policy Polling | May 15 | 831 | 47 | 48 | R+1 | — | −8.5 | B+ | Wikipedia |
| We Ask America | May 13 | 888 | 43.5 | 35.1 | D+8.4 | — | +0.9 | B+ | Wikipedia |
| Susquehanna Polling & Research, Inc. | May 10 | 400 | 44 | 38 | D+6 | — | −1.5 | B | Wikipedia |
| Public Opinion StrategiesR-sponsored | May 4 | 400 | 41 | 43 | R+2 | — | −9.5 | B | Wikipedia |
| Global Strategy GroupD-sponsored | Apr 28 | 400 | 44 | 36 | D+8 | — | +0.5 | C | Wikipedia |
| Impact ResearchD-sponsored | Apr 28 | 406 | 43 | 41 | D+2 | — | −5.5 | C | Wikipedia |
| Public Policy Polling | Apr 17 | 1,197 | 41 | 44 | R+3 | — | −10.5 | B+ | Wikipedia |
| McLaughlin & AssociatesR-sponsored | Apr 15 | 300 | 40 | 39 | D+1 | — | −6.5 | C− | Wikipedia |
| Global Strategy GroupD-sponsored | Apr 14 | 400 | 41 | 38 | D+3 | — | −4.5 | C | Wikipedia |
Adjusted: after correcting for the pollster's house effect and likely-voter screens. Miss: the poll's margin minus the result; + means the poll leaned Democratic. Grade: the pollster's accuracy in past elections, A+ to D (pollster ratings).
Source: Each poll's release, via FiveThirtyEight poll listsUpdated May 15, 2010