Republicans should study Colorado’s change

DENVER — Social scientists, say Colorado boosters, have plausible metrics identifying their state as the happiest and healthiest state, the former quality perhaps producing the latter. Or the other way around. Or maybe the tangle of causation cannot be unwoven. Be that as it may, 300 days of sunshine — this Mile High City is practically cheek-by-jowl with the sun — entice people into outdoor activities that help the state have chubby America’s lowest obesity rate.