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The most accurate polls of 2012

The 28 polling organizations by the accuracy of their final, national pre-election estimates, via the Fordham University Department of Political Science (updated):

1. Ipsos/Reuters

2. YouGov

3. PPP (D)

3. Daily Kos/SEIU/PPP

4. Angus-Reid*

5. ABC/WP*

6. Pew Research*

6. Hartford Courant/UConn*

7. Purple Strategies

8. NBC/WSJ

8. CBS/NYT

8. YouGov/Economist

9. UPI/CVOTER

10. IBD/TIPP

11. Democracy Corps (D)*

12. CNN/ORC

12. Monmouth/SurveyUSA

12. Politico/GWU/Battleground

12. FOX News

12. Washington Times/JZ Analytics

12. Newsmax/JZ Analytics

12. American Research Group

12. Gravis Marketing

13. National Journal*

14. Rasmussen

14. Gallup

15. NPR

16. AP/GfK

*Fordham's Costas Panagopoulos, Ph.D. writes: Most (18) polls overestimated Romney support, while ten (10) overestimated Obama strength (indicated with a * below), but none of the 28 national pre-election polls I examined had a significant partisan bias.

This post has been updated.