Derek Muller (Iowa), Ranking the Most Liberal and Conservative Law Firms Among the Top 140, 2021 Edition:
I captured about $64 million in contributions to Democratic-affiliated groups compared to about $11 million for Republican-affiliated groups in 2017-2020, nearly a 6-to-1 ratio.
Below is a visualization of the AmLaw100 law firms. (By “percentage of contributions,” I mean by dollar figures, not individual instances.)
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