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The individual voters featured in this book come from ten counties that switched allegiances from Barack Obama in 2012 to Donald Trump in 2016, in the five pivotal Great Lakes or Rust Belt states of Michigan, Ohio, Pennsylvania, Wisconsin, and Iowa. Those counties were chosen to ensure as much variety among the population tiers listed above as is possible.
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Salena Zito (The Great Revolt: Inside the Populist Coalition Reshaping American Politics)