Follow the money, starting with State and then Federal taxpayer-provided funds for an industry that has no track record of success, like most liberal programs. It isn't the research into embryonic stem cells that is important here. It is who heads the agencies to distribute the money, and where it gets distributed.
The industry has been in business 15 years with no results.
Adult stem cells have over 80 active success stories.
Are you implying that Mitt made his veto based upon whom would get the funding? ... If so, I would disagree since I believe he made his veto based upon principle, the principle of opposing dehumanization of human life at earliest ages.