According to Muller, he 'identified 3,148 law faculty who contributed only to Democrats in this 5+ year span - 95.9% of the data set of those identified as contributing to either Democrats or Republicans in this period.'
For example, if you look at some school's campaign donations, you cannot find people you might expect to find. Professor Amy Wax at Penn, for example, either gave to the Democratic Party or did not donate at all at the levels to be in the data at all.
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