These partisan comedians are so bitter in their partisanship that they're about as funny as a dead mouse.
..without being partisan or bitter about it.
And Dennis Miller manages to be partisan without coming across as bitter.
These guys you like to post YouTube links to all the time are apoplectic with liberal rage, to the point that they're not even funny.

You're no fun at all.
It's amazing that all you see is "bitter[ness]" and "rag[ing]" in those clips. Not even the "Shocks the Conscience" picture amused you?
I'd make some comment about you projecting your rage and bitterness on the vast majority of people. But man, at this point in the game, it's completely unneccesary.