I'm probably not the right person to evaluate political humor. Even libertarian jokes require that you only tell one side to it, and I can't enjoy them, even if I agree with them.
It just takes something really clever or neutral on the bias perspective to get me to laugh. Like the mayor in Toronto was funny to me. Making fun of Bush for being dumb or Obama for his disastrous administration is fine, but I just don't think it's that entertaining.
I like Colbert, but I don't like Stewart, even though I think Stewart is a pretty equal opportunity critic.