I too am careful about revealing my political leanings at work. I think I know someone very well, but then I find that sometimes I am surprised by a person's views on issues near and dear to my heart. I have to be careful, because I know that revealing your political leanings in a work situation can actually can alter how someone views you.

For the record, my leanings are towards the left.

Some of my very good friends are more conservative than I am. I just look at it as one of the interesting differences among friends!