Nope, I keep my political views to myself in real life. I don't feel the need to tell the world how I feel and who I'm voting for (besides online... :lol Err... Yeah, so in real life I don't bother with any signs or bumper stickers that'll make my car look worst.
I've got four bumper stickers (one for the traditional show of support, and three to cover up paint transfer and bumper damage). While I've helped make yard signs, I'm in a flag lot so it wouldn't do much good.
I do like having bumper stickers though. Stirs up a lot of conversation in parking lots. Sort of like wearing a political t-shirt leads to conversation.