In general, you would have no liability. However, in the current climate, the 1st Amendment is void where considered offensive. This started with the
Paladin Press Case.
There is some good reading here:
http://en.wikipedia.org/wiki/Categor...peech_case_law
Go get the actual cases on Findlaw though, dont rely on the statements of the Wikipedians to be accurate to the letter, only just in general.