Reporting from Port-au-Prince, Haiti — Wyclef Jean's candidacy for president of this rubble-strewn country gives a charge of electricity to what so far has been feeble interest in upcoming elections. But the heroic narrative he's pitching — hip-hop superstar returning from America to rescue his homeland — will quickly get battle-tested in the fractious, murky and often violent world of Haitian politics. Jean's humanitarian organization, Yele Haiti Foundation, and his status as the most famous member of Haiti's diaspora give him immediate prominence. Young people, for the most part, seem to love him. "Bon bagay," said Saintil Wilson, 22. "Good...