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The survey says...The data suggest that the ill may have been particularly susceptible to Mr Trump’s message. According to our model, if diabetes were just 7% less prevalent in Michigan, Mr Trump would have gained 0.3 fewer percentage points there, enough to swing the state back to the Democrats. Similarly, if an additional 8% of people in Pennsylvania engaged in regular physical activity, and heavy drinking in Wisconsin were 5% lower, Mrs Clinton would be set to enter the White House. But such counter-factual predictions are always impossible to test. There is no way to rerun the election with healthier voters and compare the results.