A campaign to nullify the Electoral College has come to a screeching halt. For more than a decade, the National Popular Vote Interstate Compact (NPVIC) added states until reaching nearly three-quarters of its goal. Yet now it is moving backward, with states that nearly joined in the past rejecting it with large bipartisan majorities. Of 29 NPVIC bills introduced in 16 states, just two received a hearing, and those were voted down with Democrats and Republicans unified in opposition. Rather than a bump in the road, this may be a dead end. The National Popular Vote movement began in 2006,...