Josefina Vasquez Mota, center, presidential candidate of Mexico’s National Action Party, PAN, casts her vote during the party’s primary
Josefina Vasquez Mota, center, presidential candidate of Mexico's National Action Party, PAN, casts her vote during the party's primary elections in Huixquilucan, Mexico, Sunday, Feb. 5, 2012. (Alexandre Meneghini/AP)

MEXICO CITY- A new poll suggests that Mexico's presidential race is tightening.

The polling firm GEA/ISA says the lead of candidate Enrique Pena Nieto has dropped to 7 percentage points. He had a 20 percent lead in a January poll by the same company.

The survey indicates 36 percent of voters favor Pena Nieto while 29 percent back Josefina Vazquez Mota of the conservative National Action Party that now governs Mexico.

Pena Nieto's Institutional Revolutionary Party ruled Mexico from 1929 to 2000.

The poll published Thursday by the newspaper Milenio shows 17 percent back leftist Andres Manuel Lopez Obrador.

The February 17-19 poll of 1,000 potential voters has a margin of error of 4 percentage points.