The final opinion polls to be released before Mexico's July 2 presidential elections show leftist candidate Andres Manuel Lopez Obrador with a slim lead over his closest rival.
The polls by Reforma and El Universal newspapers both put Lopez Obrador, of the Democratic Revolution Party, ahead of Felipe Calderon by a margin of 36 to 34 percent. Calderon represents the ruling National Action Party.
Roberto Madrazo of the former ruling Institutional Revolutionary Party was in third place. Most polls this week indicated he had 25 to 30 percent of voter support.
The Reforma survey of 2,100 registered voters took place June 17 through the 19 and had a margin of error of 2.3 percentage points. El Universal surveyed 2,000 people between June 16 and the 19. Its poll had a margin of error of about three percent.
The candidate who wins the election will succeed President Vicente Fox, who by law cannot seek a second term.
Some information for this report provided by AP and Reuters.