So he prefers to present himself as a successful business man, opening himself to criticism on the same count. As a venture capitalist his goal was not to create jobs ("I like firing people!" he said), but to make money for Bain Capital's executives and stockholders. He did a good job at that, but that doesn't qualify him as an expert on job creation, and it certainly doesn't qualify him to be President of the United States.
His strategy has been to attack, always attack, everything the President says or does. Thus he has put himself in a deservedly awkward position. He doesn't know how to boast about the one thing he has to point to regarding his work as Governor of Massachusetts. He signed into law a health care act that earned the praise of President Obama, and it became something of a model for the Administration's Affordable Health Act.
So Mr. Romney doesn't talk about "Romneycare," because it's too much like "Obamacare"! His health care program for Massachusetts even has an individual mandate, which the Republicans are hoping the Supreme Court will rule is an unconstitutional provision of the Federal program. If they do, Romney will applaud their decision and use it to attack the President all the more.
The inconsistency of his attacking his opponent for things he himself once favored doesn't bother Mr. Romney one bit. Logical consistency has never been one of his attributes. If I may modify a familiar cliche, his words speak for themselves! ("I'm not familiar precisely with exactly what I said there, but I stand by what I said, whatever it was"!)