MEXICO CITY, Mexico -- Mexico's top electoral court on Saturday rejected a ballot-by-ballot recount in the disputed presidential election, angering supporters of leftist candidate Andres Manuel Lopez Obrador who have kept the nation in turmoil for weeks. In Mexico's central plaza, thousands of protesters watched the court session on a huge screen, chanting "Vote by vote!" and drowning out the judges' statements. Representatives of Lopez Obrador walked out of the session in protest. Tens of thousands of Lopez Obrador's supporters have camped out in the capital's center for a week, disrupting business and traffic to press their case that their...