Barack Obama Celebrity T-Shirt

People are always coming here looking for celebrities like Halle Berry wearing Barack Obama T-Shirts. I can't figure this out for the life of me. Are people looking for celebrity endorsements of Barack Obama? Or do people just want to wear the T-Shirt that a celebrity is wearing to show their personal Barack Obama support? As in, kill to birds with one stone by simultaneously being fashionable and political. I'm stumped.