Mitt Romney announced on Monday that he was forming an exploratory committee to run for president, which raised eyebrows because the news closely coincided with today’s fifth anniversary of the passage of his signature legislation as governor of Massachusetts, the state’s health care law. Given that his signing of the measure promises to dominate the Republican presidential primaries, I thought I’d review the top five failed defenses of the law that have been offered by Romney and his supporters, in no particular order.

The Massachusetts plan was a free market approach, but ObamaCare is a government takeover: