The first countries that popped into my head were the Scandinavian countries (Norway, Sweden, Finland) and good 'ole Canada. I do not know which of the Canadian provinces would be the most liberal, yet as a bonus you wouldn't be too far from Massachusetts, Canadians speak English with a smattering of French, and the healthcare system is good. Canada seems like a good starting point with secondary options in Europe.
As an aside, I would feel weary of moving to Central America (Belize). High rates of homicide and property crime.