Put up a competing bar called Stalin's Gulag. Come and drink your miseries away. Obama would probably even approve.
I'm not sure even that would do it. To a lot of leftists and democrats, Stalin was merely doing what had to be done. You have to break about 40 million eggs to make a Utopian omelet after all.
Hitler on the other hand, well he's the epitome of all evil. Pol Pot somehow doesn't get a pass either despite the fact that he basically had the same aims and methods as Stalin.