What the explosive growth of 'blowout counties' means for U.S. politics

In 2000, the presidential candidates scored 50-point wins in 10% of counties across the country. Today, that has climbed to 40% as voters cluster and sort themselves.
via: https://www.nbcnews.com/politics/elections/explosive-growth-blowout-counties-means-us-politics-rcna211745

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