Seriously though, sure, any of the 'risks' you mentioned are possible. The more liberal the area you live in, the greater the risk.
UNDO (the O in the Obama mold)... Stop the march towards socialism... Vote GOP in 2012... is pretty low key, so I wouldn't worry too much about it.
I've got one of these on my bumper:
I don't think that would go over very well in NYC.