Could very easily portray that the Reps receive an somewhat healthy economy that the Dems created then eff it up, the the Dems get back in control to fix it and the Reps eff it up again. Since there is a lag in the amount of time it takes for the changes to have an effect, it just looks like the Reps are the ones taking care of things.
I'm not saying that's a fact, just saying that graph can be perceived in different ways.
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