This is new? It's been going on with the MSM and PBS as long as I can remember. I'll never forget one memorable PBS panel that was mustered to discuss the "new" phenomenon of conservative talk radio back in the early 90s. The unmentioned subject was Rush, of course, and every single radio talker on the panel was full-bore liberal. That's "balance" as the Rats see it. All opposing ideas and speech must be suppressed.
3:1 is nothing new, but 4:1 might be a new record for lopsidedness.