"Consider this remarkable statistic. In 1980, 32 percent of the electorate consisted of white Democrats (or at least white Carter voters) -- likewise, in 2008, 32 percent of the electorate consisted of white Obama voters. But whereas, in 1980, just 9 percent of the electorate were nonwhite Carter voters, 21 percent of the electorate were nonwhite Obama voters last year. Thus, Carter went down to a landslide defeat, whereas Obama defeated John McCain by a healthy margin," - Nate Silver. Tom Edsall's must-read take on these implications is here.

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