Media Matters study also finds that all the networks' guests tilt right on the five morning shows.
Tuesday marks the former anchor's return to TV since he was suspended in February.
The newsman admitted to wanting to "appear better" than he was.
Brian Williams was suspended without pay in February for exaggerating his experiencse.
How much do you need to trust the man reading a teleprompter?
The executive behind broadcast newcomers Escape and Grit is capitalizing on cable's decline.