If they call you racist for not supporting Obama, just act incredulous and say “Obama is black?!?! No way! I thought he was Hawaii’an. Now that I know, I back him 100%” and see how they react.
And if you really want to convince them of your political correctness, you'll make sure to spell Hawai'ian with the apostrophe. Libs love it when you're linguistically correct when spelling or pronouncing foreign names, etc.