In updating some graphs today, I discovered something interesting (but not entirely unexpected). The House of Representatives appears to be de-polarizing.
Of course, it’s also possible that this is just a blip.
The graphs begin in 1856-7, which is the first session with both Republicans and Democrats in the House (data). Here is the usual plot, based on distances between the party medians:
And here is another with distances between the party means:
Thanks to Dr. Jennie Sweet-Cushman for the prod.