Some advice my liberal friend:
1) Just assume that you're going to be temporarily banned if you serve some conservative admins their hat while debating an issue. It's not a true banning but more of a "I'm being soundly thumped here and need a way out so maybe everyone will forget if he 'goes away' for 24 hours" ban. Short of that, they may just "remove" you from a particular thread when they're wrong and you've proven them wrong for the umpteenth time. It's all good. You'll survive. Move on to the next thread and carry on with the liberal viewpoint. So far I have absolutely no indication they'll unfairly permanently ban you simply for having a liberal view point.
2) They prefer the Alan Colmes type liberals here... you know, almost-Republican apologists. They'll bash you to no end and then whine like babies and then you might get banned for a short while and then you'll come back in a day or two and start over. Meanwhile, they'll have trashed the thread you're in with stuff like, "where'd you go chicken?"
3) Prepare yourself for conservative hypocrisy out the yingyang. They'll cry and whine about black leaders calling Justice Thomas an 'Uncle Tom' and then call you a 'wigger' in the same thread. They'll watch someone post half a dozen conservative articles in rapid succession (with sources like neoconcontrolcenter.com) and say nothing, but as soon as you post three liberal viewpoint threads they'll accuse you of "running to DU." They'll say nothing when someone falsely accuses you of allying with the Westboro Baptist Church but then, in the very same thread, will scream like little children when you do the same to them. Just be ready for it. Sometimes I think I'm in mock-indignation++land
4) Be ready for a constant barrage of links to hooked-on-phonics, reading is fundamental and so forth because many conservatives seem to be unable to remember what they previously posted or are incapable of saying what they actually mean and have to revise and change their position five times. This is their defense mechanism... they can't articulate what they want to say, so YOU'RE stupid. Don't let your feelings be hurt. They don't mean to be so mean... their parents just didn't hug them enough. Try to be as understanding as possible.
5) They're really touchy about the rep points thing. It's kind of like a self-congratulatory circle jerk in that they run around patting each other on the back for sounding like Westboro Coulter. Sometimes you can give some love for an Alan "I'm Sorry" Colmes-type post. But, that's about it. My suggestion, just stay away from the repping thing. To some it's like their life to them. One guy even told me he was going to "hurt" me with the rep point thing... as if I cared.
But, as to your question... no, I don't think you're going to be permanently banned for having a liberal viewpoint. The conservatives don't like it when you stand up to them; but, I think we're done with watching liberals let conservatives trample all over us with their screachy, mealy-mouthed arguments.