Around 12 percent of Bernie Sanders’ supporters 13.2 million in the 2016 Democratic Party primary against Hillary Clinton ended up supporting former President Donald Trump in the general election, or almost 1.6 million, according to the Guide to the 2016 Cooperative Congressional Election Survey released by Harvard University in Aug. 2017.
That included 9 percent of Sanders’ 570,000 Wisconsin supporters, or 51,300, 8 percent of his 590,000 Michigan supporters, or 47,200, and 16 percent of his 732,000 Pennsylvania supporters, or 117,120.
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