It’s conventional wisdom that President Trump has transformed American politics. But a new county-by-county voting analysis from The New York Times of the last four presidential races shows just how drastically Mr. Trump has changed the electoral map.Shane Goldmacher, a national political correspondent for The Times, explains why the trends are a five-alarm fire for the Democrats and discusses the debate within the party over what to do about it.Guest: Shane Goldmacher, a national political correspondent for The New York Times.Background reading: 

• How Donald Trump has remade America’s political landscape.
• Six months after the election, Democrats are still searching for a path forward.

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