Gallup regularly asks poll respondents their party identification. The graph above shows the trend in party id since, roughly, the beginning of 2004. There is a general trend away from the Republican party, but not necessarily to the Democrats. It's also interesting to note that the anti-GOP trend has stopped, and possibly reversed, since the November 2008 election.
The pale dots reflect specific poll results, the wiggly solid lines represent LOWESS-smoothed trends, and the dotted lines represent linear trend estimates based on bivariate OLS regression.
The pale dots reflect specific poll results, the wiggly solid lines represent LOWESS-smoothed trends, and the dotted lines represent linear trend estimates based on bivariate OLS regression.
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