The published polling in this year’s presidential race is unusually inaccurate because this is the first election in which who votes determines how they vote. Obama’s massive leads among blacks, Latinos, young people, and single women vie with Romney’s margin among the elderly, married white women, and white men. Tell me your demographic and I’ll tell you who you’re voting for and I’ll be right at least two times out of three!

Most pollsters are weighting their data on the assumption that the 2012 electorate will turn out in the same proportion as the 2008 voters did. But polling indicates a distinct lack of enthusiasm for the president among his core constituency. He’ll still carry them by heavy margins, but the turnout will likely lag behind the 2008 stats. (The 2008 turnout was totally unlike that in other years with all-time historic high turnouts among Obama’s main demographic groups).

Specifically, most pollsters are using 2008 party preferences to weight their 2012 survey samples, reflecting a much larger Democratic preference than is now really the case.

In my own polling, I found a lurch to the Democrats right after their convention, but subsequent research indicates that it has since petered out. Indeed, when one compares party identification in the August and September polls of this year in swing states, the Democratic Party identification is flat while the ranks of Republicans rose by an average of two points per state.

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