This fits my perception as well. I'd also add that the political compasses and candidate choosers have been a place where you can see the leftward lean. I thin

This fits my perception as well. I'd also add that the political compasses and candidate choosers have been a place where you can see the leftward lean. I think it is a similar root cause to the coverage selection issue. In The Righteous Mind, Jonathan Haidt talks about a particular failure mode that some people on the left exhibit when asked to fill in a political questionnaire the same way a conservative or libertarian would. I think that is what's happening here.