LOS ANGELES - Dennis Hopper is a Republican."People would be surprised to know that," says Hopper, maverick star and director of the '69 hippie-stoners-on-bikes classic, Easy Rider, in a recent interview."I've been a Republican since Reagan. I voted for Bush and his father. I don't tell a lot of people, because I live in a city where somebody who voted for Bush is really an outcast."One of Hollywood's legendary enfants terribles, Hopper, 69, is so straight now it's almost scary.He's been sober for 22 years. He plays golf. He wears suits and ties. And now he's...