How Trumpy Conspiracy Nut Revealed Harris’ Husband’s Past Affair

For four years, an obscure election denialist named Mark Mendlovitz tried hawking a story that Doug Emhoff’s first marriage ended because he had an affair. Media outlets, he claimed in an exclusive interview with the Daily Beast, refused to run it.

On Saturday, the Daily Mail broke the story, publishing a piece that alleged the Second Gentleman cheated on his first wife, Kerstin, with Najen Naylor, a teacher at their children’s school—and got her pregnant.

Shortly after...