The Pew Research Center and Rasmussen Reports were the most accurate in predicting the results of the 2008 election, according to a new analysis by Fordham University political scientist Costas Panagopoulos.

The Fordham analysis ranks 23 survey research organizations on their final, national pre-election polls, as reported on pollster.com.

On average, the polls slightly overestimated Obama’s strength. The final polls showed the Democratic ahead by an average of 7.52 percentage points — 1.37 percentage points above his current 6.15-point popular vote lead. Seventeen of the 23 surveys overstated Obama’s final victory level, while four underestimated it. Only two — Rasmussen and Pew — were spot on.

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