It's not so much that Romney happens to be from MA, as that he was able to get elected there!
Either he believes what he had to say to get elected in MA, or he doesn't and believes in what he's saying now.
But which?
Romney did have to soften his conservative stance on several issue to get elected in MA. I think he was all long more of a conservative than he could display as Governor of MA. So now even though he is revereting back to his actual roots it can very easily be construed as shifting or flip flopping.
In either case, the MA link will sink him which is too bad because he is the only candidate on either side that has run successful businesses, had employees, has been a CEO, has a very stable family life and is probably the best communicator.