The Electoral College is under fresh assault on the heels of Donald Trump's victory last November—the second time in five presidential races the popularly elected candidate lost the election—but it's not due to any groundswell in Congress for a constitutional amendment to adopt a national popular vote. Instead, the most viable campaign to change how Americans choose their leader is being waged at booze-soaked junkets in luxury hotels around the country and even abroad, as an obscure entity called the Institute for Research on Presidential Elections peddles a controversial idea: that state legislatures can put the popular-vote winner in the White House.