Opposition candidate Enrique Pena Nieto is leading Sunday’s presidential election in Mexico, exit polls showed on Sunday.
Nieto, a candidate from the Institutional Revolutionary Party (PRI), is gaining 39 to 42.7 percent of the vote.
Leftist candidate Andres Manuel Lopez Obrador, representing the Democratic Revolution Party (PRD), is coming second with 30.8-34.4 percent.
Josefina Vazquez Mota from the ruling conservative National Action Party (PAN) is third with 22.1-25.7 percent.
Incumbent President Felipe Calderon, who has been in power since 2006, is barred by the constitution from seeking a second term.
The PRI, which ruled in Mexico in 1929-2000, is trying to regain the presidency after losing the last two elections to the PAN.
Nearly 80 million Mexicans were eligible to cast ballots in Sunday’s vote.
Some 31,400 monitors, including around 700 international observers from 66 countries, monitored the polls.
Mexicans also elected Mexico City’s mayor, governors of six of Mexico's 31 states, parliament deputies and heads of municipal entities.