Pat Egan sends along this monstrosity:

It would be a fun exercise to find all the problems with the above plot.

I’m really glad to have it out there, though. Next time we mock Fox News for one of its ridiculous graphs, we can point to this even worse image for partisan balance.

P.S. They also supply a clean time series, lower down on the page:

Pretty scary, actually.

[Cross-posted at The Monkey Cage]

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Andrew Gelman is a professor of statistics and political science and director of the Applied Statistics Center at Columbia University.