Just curious, is it against the rules to show in your signature which candidate you would most or least want to see elected President next year? I know political avatars seem to be allowed.
Avatars and signatures, as well as other profile fields, must comply with all forum rules, including those against profanity, explicit sexual content, insults against groups or individuals, referral links, and cannot be in other ways offensive. Members will be required to change avatars or signatures that are deemed too controversial or that are particularly annoying or distracting to other members. Note that signatures may include links to your own site or business as long as you do not make posts whose purpose is to call attention to your signature. A political signature is fine, as long as it doesn't violate the rules for sigs outline here.
Basically, in addition to the formatting requirements, just make sure you don't word your political statement in a way that seems trollish/designed to rile people up, and you'll be fine.
So if I want to have a political signature, I can say "X Rocks" or "X for President" or "Vote X in 2012," but I can't say "Y Sucks," "Y Is A Liar," etc.