Many people talk of Chomsky here, but have they listened to him debating a point or did they read some of his papers?
I came across some of his writings in a past research for a course of International Relationships and I did watch him debate quite a few people. I have rarely ever seen someone who's as articulate, clear and nuanced as he is in his thoughts... it's profoundly impressive to watch when he's debating someone. One of my teacher told me once that Chomsky was overlooked by many political scientists because he didn't have any credential in the field, but that he also earned much respect within this same field because of the very substantive arguments he puts forward in his papers. Having read him and having looked through his sources, he's indeed showing very, very solid points.
As for conservatives, most of those we see are playing a political game... they're selling their ideas and they're well paid to do it. Same with Democrats, although they probably do not defend the same sort of interests. Still, politics is about power and interests, not truth. So, it's hard to tell if anyone within their group could debate Chomsky properly.