Here's Maher's tweet that people interpreted as defending Limbaugh.
Here's the information about what happened to Maher 10 years ago. His late-night ABC show "Politically Incorrect" was canceled after a controversy over an edgy remark he made one week after the September 11th. ("We have been the cowards, lobbing cruise missiles from 2,000 miles away. That's cowardly. Staying in the airplane when it hits the building, say what you want about it, it's not cowardly.")
Maher went on to criticize that "fat fuck" Limbaugh: Right-wingers have made a "false equivalence" between Limbaugh and him. "I am a potty mouth. That's different from a misogynist."