Yep :-)
alt.politics.usa.constitution.gun-rights
talk.politics.guns
alt.politics
alt.current-events.clinton.whitewater
Remember: These newsgroups are unmoderated. That means foul language of all kind, insults, threats, nuclear sized flame wars, spam, etc., are the norm there. Free speech reins. There is no one you can complain to that will listen. Most, if not all ISP's couldn't care less what their members do on the usenet newsgroups.
Here's another link for you. A newsgroup reader called Free Agent (It's free software): http://www.forteinc.com/agent/freagent.htm
(As I understand it, you can't use this software with AOL)
A tip: If you post to newsgroups, spammers use software to strip email addresses from the newsgroups so that they can send you junk mail and sell your email address to more spammers. Be sure to change your email address to something phony. (You'll notice in the newsgroups that lots of others do this)