2010 special election for U.S. Senate in Massachusetts
U.S. Senate · Massachusetts
Scott P. Brown (R) won with 51.9% of the vote, defeating Martha Coakley (D) by 4.8 points.
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)
Money in this race
Each line compares the two campaigns on one scale.
Other candidates' campaigns: Joseph Kennedy $27K.
Campaign money: FEC, through Dec 31, 2010.
Source: FEC campaign filingsUpdated Dec 31, 2010
Polls against the result
- Poll with Coakley ahead
- Poll with Brown ahead
- Result
| Pollster | Dates | Sample | Coakley | Brown | Margin | Adjusted | Miss vs result | Grade | Release |
|---|---|---|---|---|---|---|---|---|---|
| CrossTarget | Jan 17 | 574 | 42.3 | 51.9 | R+9.6 | — | −4.8 | C+ | Wikipedia |
| InsiderAdvantage | Jan 17 | 804 | 43.1 | 52.2 | R+9.1 | — | −4.3 | B | Wikipedia |
| American Research Group | Jan 16 | 600 | 45 | 52 | R+7 | — | −2.2 | C+ | Wikipedia |
| Public Policy Polling | Jan 16 | 1,231 | 46 | 51 | R+5 | — | −0.2 | B+ | Wikipedia |
| MRG Research | Jan 15 | 565 | 41.2 | 50.8 | R+9.6 | — | −4.8 | A− | Wikipedia |
| CrossTarget | Jan 14 | 946 | 38.5 | 53.9 | R+15.4 | — | −10.6 | C+ | Wikipedia |
| American Research Group | Jan 13 | 600 | 45 | 48 | R+3 | — | +1.8 | C+ | Wikipedia |
| Suffolk University | Jan 12 | 500 | 46 | 50 | R+4 | — | +0.8 | A | Wikipedia |
| Scott Rasmussen | Jan 11 | 1,000 | 49 | 47 | D+2 | — | +6.8 | B− | Wikipedia |
| Mellman GroupD-sponsored | Jan 9 | 800 | 50 | 36 | D+14 | — | +18.8 | C | Wikipedia |
| Public Policy Polling | Jan 8 | 774 | 47 | 48 | R+1 | — | +3.8 | B+ | Wikipedia |
| Scott Rasmussen | Jan 4 | 500 | 50 | 41 | D+9 | — | +13.8 | B− | Wikipedia |
| University of New Hampshire | Jan 4 | 554 | 53 | 36 | D+17 | — | +21.8 | 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 Jan 17, 2010