This site makes good efforts to maintain some neutrality, efforts which I think are successful.
However, sympathisers of the US republican party claim there is a pro-US democratic party bias on this website:
Are liberals incapable of seeing their own bias?
The liberal bias on this site is getting out of control
There would be a good way to either corroborate or disprove this, it is to ask for the political leaning of the users. I was thinking about asking several questions on large issues (liberal/controlled/planned economy; liberal/conservative society; environmentalism; secularism; equality before the law; ... )
Should we do something like this ?
I am aware that the conclusions of this poll would not mean much on the quality or bias of the answers written. It would indicate which biases we should be careful about. It would also indicate the representation of different political trends which could be useful. The poll could eventually be used again if someone claims there is a bias against his/her political opinion.
My personal empirical opinion on this is that it is indeed hard on this site to be a GOP sympathiser. But they are facing something different than a liberal bias against them. Comes to mind the fact that non-US users may be generally less close to the GOP, or that their party's positions are more easily challenged by factual studies.