I mostly lurk in here, but I think AT is a lot to the left on most issues for several reasons.
Below are just a few opinions with no facts to back them up.
1.) There are a lot of people here who live in more liberal areas, (Lots of Canadians, Californians, New Yorkers, etc, where a large majority leans more to the left)
2.) There are a lot of atheists on these boards. We don't like the idea of mixing religion and politics. The "far right" includes a lot of people who take their religion very seriously, where as the left doesn't bring up religion as much.
3.) AT is mostly younger people, my experience has been more people who are order lean to the right, and people who are younger lean to the left.
4.) Lots of ATers are highly offended that minorities don't always get total equality when it comes to rights. (for example, gays or lesbians who want to marry)
That being said, lots of AT is left on many social issues, but on some issues, such as gun control, you will find a lot of fence jumpers.
Personally, I think that a majority of AT folks would fit into the "Libertarian" stereotype moreso than the pure leftist stereotype, but perhaps I have a bias there, as I personally consider myself as a Libertarian.
And ProfJohn, I agree with some of the other posters here, that perhaps the majority isn't "extreme left", instead the majority on AT is probably "slightly to moderate left" and you are "extreme right."
That being said, we will disagree on many things (I am extremely pro-immigration (not illegally, but vastly increasing quotas and simplifying the process for legal immigration), pro raising taxes (until the national debt is 0, then lower them to whatever level will result in financial equilibrium, and never build up a deficit), pro gay marriage, probably many others.)
That being said, lots of the "left" will disagree with me on many issues, and I (as well as others) lean to the right. For instance, I believe very strongly in National Defense. I also am very "pro Israel." I embrace all of the amendments on the bill of rights. I don't pick and choose like many of both the far right and the far left. I believe the first amendment is limitless and absolute (you'll probably disagree as I think things like flag burning, while offensive, are protected by the first amendment. The purpose of the government is to serve the people. The people must always maintain total power over the government. Because of that, I also believe very strongly in the second amendment. "A Well-regulated militia, being necessary to the security of a free State, the right of the people to keep and bear arms, shall not be infringed."
That being said, there are "spinsters" on both sides, lots of people don't even appear to stay focused on the topic of the post, but instead they focus on their personal distaste for those who they disagree with. Unfortunately, it seems like that's how politics in general are these days. The left smears the right, the right smears the left, people who generally would be intelligent and thoughtful instead let their feelings talk instead of their thoughts.
I dunno, I'm just babbling like a buffoon, so I think I'll end my post soon.
PS, I'm not a "lets all just get along" wussy, but I'm not afraid to agree to disagree. Also, I know that I personally have "let my feelings talk instead of my thoughts" several times before. I ate a few flames for it. (I know I'm not perfect, and I don't want everyone to interpret me as being a hypocrite.)