From Brendan Nyhan’s post. The upshot: don’t claim that Truman’s campaign against a “do-nothing Congress” was the reason for his 1948 victory. The economy was clearly important. And don’t think that such a strategy will help Obama in 2012, given the very different economy that he faces.
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This is good (and of course I agree with the basic point) but I recommend labeling the lines directly on the graph rather than with a legend, which requires the reader to go back and forth to figure out what is happening.