Interesting choice of the timeline for the ideological leanings of Supreme Court Justices.
The progressive revolution in the supreme court was well underway in 1935. McReynolds, for example, started serving in 1914, was appointed by uber-progressive Woodrow Wilson.
It’s an old trick to cherry-pick a graph’s starting and ending point.
It’d be interesting to look at M-Q scores after Reconstruction to now.