The IBD and Zogby polls are amusing... note the huge surge in both on the very last day.
With the exceptions of Gallup and Zogby, all the polls kind of converged towards the right answer in the final days of polling. But those polls that converged on the right answer at the very end were all going in different directions throughout the rest of the campaign. Which shows how stupid measurements of "pollster accuracy" are.
What you really want to be able to measure is how accurate are the polls weeks or months before the election. But unfortunately, that's objectively unmeasurable, since you have no way of knowing for sure what the correct answer is.