an interesting look at pivot counties
particularly in Iowa, Wisconsin, Minnesota, and Maine
https://ballotpedia.org/Pivot_Counties:_The_counties_that_voted_Obama-Obama-Trump_from_2008-2016
here is Indiana
https://ballotpedia.org/Pivot_Counties_in_Indiana
particularly in Iowa, Wisconsin, Minnesota, and Maine
https://ballotpedia.org/Pivot_Counties:_The_counties_that_voted_Obama-Obama-Trump_from_2008-2016
here is Indiana
https://ballotpedia.org/Pivot_Counties_in_Indiana