In March 2020, all the major Democratic primary candidates abruptly, mysteriously, and in near unison withdrew from the presidential race, ceding the nomination to Joe Biden. Yet Biden had lost the first three races in Iowa, New Hampshire, and Nevada --and only won his first victory in South Carolina. Suddenly, on the eve of the Super Tuesday mega-primaries, the candidacies of front-runner Bernie Sanders, Pete Buttigieg, Elizabeth Warren, and others simply evaporated. The fear of a...