In Mass. he governed from the Left, because that's how he won in a state where Republicans are a meager 12% of the electorate. Honestly, I don't know how he'd govern as President, but let's do America a favor and not find out....
Romney winning as Governor in Mass. was not unusual at all, he was the fourth Republican Governor in a row, the state usually elects Rep Govs.
Romney’s effect on the state was to devastate the state GOP, leave with 34% approval, and the Democrats have owned his seat ever since.