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  1. Our figures only include those who identified themselves as Democrats or Republicans, and not independents who said they lean toward one of the parties. ^
  2. The General Social Survey did not ask this question at any point between 1998 and 2006, which accounts for the unusual smoothness of the lines in the chart during that period. ^

Nate Silver is the founder and editor in chief of FiveThirtyEight.

Allison McCann is a visual journalist for FiveThirtyEight.

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