SIO264: Did Progressive Causes Lead To House Losses?

After Democrats had a disappointing election in the House, there was a group call in which some centrist members blamed progressives. AOC responded in the New York Times. This has set off a pretty bitter debate. I wanted to get to the bottom of the claims using the actual voting data and see if there was anything to be learned going either way. Hours of data entry later, I believe I have (some) answers.