Rush got in hot water for his Donovan McNabb comment and had to leave a job he clearly enjoyed.
I imagine if Carville says anything along the same lines, no one will notice.
Rush's departure from ESPN wasn't quite as simple as his being fired for making a controversial statement. It was probably as much about the media onslaught on McNabb (which McNabb himself did nothing to invite) that followed. I'm sure the NFL doesn't appreciate commentators forcing such hardship upon its players. And since Rush isn't part of the NFL's "old boy network" he was expendable.
And remember, the painkiller story broke in the Enquirer later that week, which probably killed Rush's resolve to keep fighting for his ESPN gig.
I'd be amazed if anyone is even listening to that show to notice if Carville makes any controversial pronouncements of his own.