It is regularly derided by conservative pundits, and former Massachusetts Gov. Mitt Romney is trying his best to disavow it. But the Massachusetts universal health care law has broad and growing support in that state. According to a new poll, 63 percent of Massachusetts residents support the 2006 health law, up 10 percentage points in the past two years. Only 21 percent oppose it. However, opposition to its mandate that everyone buy health care has grown to 44 percent, up from 35 percent in 2008, though 51 percent of residents still support the mandate.