Presidential Election: Calderón Wins by 0.6%

Felipe Calderón (PAN) narrowly defeats Andrés Manuel López Obrador (PRD) by 243,934 votes — a margin of just 0.58%. The Federal Electoral Institute declares Calderón president-elect, but López Obrador immediately alleges widespread fraud and demands a full vote-by-vote recount. The razor-thin margin triggers Mexico's deepest political crisis since the 1988 disputed election.