Howard Kurtz talked to Julie Banderas on Happening Now this afternoon to discuss what's in the works for Media Buzz. One of the big topics on Sunday will be David Letterman's retirement announcement.

"What's getting a little less attention though, is the fact that he was the most political of the late night hosts and pretty open about his liberalism," said Kurtz.

Media Buzz will also touch on the lack of coverage of the General Motors recall scandal.

Kurtz said, "It's much sexier to cover the President, the White House, Congress...and I think that's part of the reason it's not seen as a sexy topic, but it's a topic that affects anybody who drives a car."

Plus, is the media looking closely enough at the ObamaCare numbers?

All that and more on Media Buzz, Sunday at 11a/5p ET.