Kevin Drum provides an answer is his post the Top Ten Things You Might Not Know But Probably Should (12/31/2020) and each one has a graph. I copied the graph from 3, The Federal Judiciary Is About the Same As It’s Always Been:
The Supreme Court gets all the attention, but the vast majority of judicial decisions that make a difference in our lives either start or end in circuit courts. Here’s what that looks like:
It’s true that Donald Trump has appointed a lot of circuit court judges, but many of them simply replaced other conservative judges. The upshot of all this is that far from being unusually dominated by Republicans, the circuit courts today are less Republican than the 40-year average of 54 percent.
His sources are cited so you can likely track down the data.
