So, the question is, are Republican Governors “common” in Massachusetts. That’s addressed by going to the list. There you will observe that Democrats are equally “common”, and that in recent times several Republican governors served partial terms thereby leading people to believe they were being overrun by Republicans. BTW, William Weld technically counts as a “Republican” in Mass, but he’s actually a RINO. See: http://en.wikipedia.org/wiki/List_of_Governors_of_Massachusetts
It wasn’t a question, it is a fact.
Republican Governors are common in Massachusetts, in fact most of them have been republican, including since 1950.
Romney was the fourth one in a row, he is not unique or unusual.