Nate Silver writes for his FiveThirtyEight website about the accuracy of political polls, and the status of the polling industry. He identifies challenges, like the proliferation of cell-phone-only households and the difficulties pollsters have in ascertaining their voting preferences.
As a consumer of political polling and a political blogger, I found Silver's article interesting. Perhaps you will too. It turns out polling presidential elections are relatively easy, while primary elections of any stripe are difficult and substantially less accurate. That, and the farther "down ballot" you go the less accurate polling becomes.
