If Alec Baldwin spewed right wing propaganda you guys would treat him like John Effing Wayne and make him the Pope of Regular Joe Town. Alas, Baldwin and his ilk are elitist, pansy liberals so, on the celebrity front, you're left with a bunch of two-bit snake oil cable and radio broadcasters to fight for what you see as the good fight in the mass market media outlets.
How much do celebrities sway public opinion? I'm really interested in seeing some sort of study. I'd guess that it'd be far, far less in matters of government than in, say, what kind of sunglasses or jeans you'd buy at the mall.
Blame the media for giving them a voice, sure, but blame yourselves for watching.