MEXICO CITY: Mexico's old rulers have regained power following 12 years in opposition, but likely will have to forge alliances with other parties to push through reforms after winning the presidency by a much narrower margin than polls had forecast.

Enrique Pena Nieto of the Institutional Revolutionary Party, or PRI, declared himself the winner of Sunday's presidential election after a quick count by Mexico's electoral authorities gave him a clear lead.

Promising to reinvigorate the economy and reduce rampant drug violence, the telegenic 45-year-old will take office in December for a six-year term as president, restoring the party that dominated Mexican politics for most of the past century, at times ruthlessly.—Reuters