US Senator Scott Brown was elected on a promise to be the 41st vote that Republican senators needed to block Democrats from passing a major health care overhaul. But Democratic leaders devised a way to skirt a Republican filibuster, meaning the Affordable Care Act became law in spite of Brown’s 2010 victory. Almost three years later, that law remains a bright line in Massachusetts politics, separating Brown and challenger Elizabeth Warren on health care: He would repeal it, she would keep it in place.
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