The presidential election could be delayed or scrapped altogether if conspiracy theories become predictive and a candidate dies or drops out before Nov. 8. The perhaps equally startling alternative, if there's enough time: Small groups of people hand-picking a replacement pursuant to obscure party rules. The scenarios have been seriously considered by few outside of the legal community and likely are too morbid for polite discussion in politically mixed company. But prominent law professors have pondered the effects and possible ways to address a late-date vacancy. "There's nothing in the Constitution which requires a popular election for the electors serving...