No Labels, a political organization that has alarmed some Democrats with talk of launching a third-party presidential candidate, has contemplated requiring a donation of at least $100 in order to cast a ballot at the group’s upcoming nominating convention, according to documents obtained by The Associated Press. The idea, which breaks from longstanding norms, would raise a significant hurdle to participating in the democratic process — in this case No Labels' selection of its potential candidates for president and vice president. The possibility of requiring a donation was...