Mitt Romney, govenor of Massachusetts, wants to be president, so he is trying to impress religious conservatives by opposing stem cell research:
I don't seem to remeber Romney running for election as a social conservative (and I was living in Boston when he was elected). For more of my thougths on stem cell research see here.
Mr. Romney, a Republican, wants the largely Democratic legislature to adopt a definition that says that life begins at fertilization.
"To change the definition of when life begins is a very significant moral and ethical change," Mr. Romney said. "They can accomplish all the stem cell research they wish to without making that change."