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Mood swings? Nineteen post-graduate degrees in mathematics, and your best explanation for going from a 63 to a 46 percent approval rating in five weeks is mood swings?
— Lewis · The American President

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker is incredulous that someone with nineteen advanced mathematics degrees blames a steep fall in approval ratings on mood swings. The sarcasm points to a mismatch between great expertise and a flimsy explanation for such a dramatic drop in five weeks.
Context reviewed