(Reuters) – Martha’s Vineyard is a largely liberal island off Cape Cod, Massachusetts, frequented by some of America’s richest and most powerful people. Now it has taken center stage in the U.S. political fight over immigration. On Wednesday, Republicans flew a group of migrants to this favored vacation spot of Democratic presidents. Florida Governor Ron DeSantis, a potential Republican presidential candidate, said he was behind it. Here are some facts about Martha’s Vineyard: * Christina Pushaw, a DeSantis spokesperson, posted a photo on Twitter showing a property owned by Democratic former P…