Communism By Democracy - A Hypothetical

At some point in the future, the majority of US voters come to believe passionately in communism. As the presidential election approaches, all polling data points to a probable win by the communist party candidate. And I don't mean 'communist' like Barack Obama or George W. Bush, but rather, a real red-tempered communist like Fidel Castro.

As a person who believes in liberty and markets, what is your best course of action?

Assassination?
Spurring revolution?
Creating/promoting an opposition party?
other?

Follow-up: Get out while you can
Follow-up: Where would you go?