Institutional Revolutionary Party, or PRI, presidential candidate Enrique Peña Nieto is still the frontrunner in the race, enjoying a lead of 14.2 percentage points over leftist Andres Manuel Lopez Obrador in the contest to be Mexico's next leader, the latest Consulta Mitofsky poll shows.

Peña Nieto has the support of 43.8 percent of likely voters, excluding undecided voters, while Lopez Obrador has the backing of 29.6 percent of likely voters.

The numbers for the two leading candidates barely budged in the weekly poll.

National Action Party, or PAN, candidate Josefina Vazquez Mota, however, saw her support slip from 25.3 percent to 24.8 percent, while longshot candidate Gabriel Quadri, of the New Alliance Party, or PANAL, drew just 1.8 percent support in the weekly Consulta Mitofsky poll, marking his poorest showing so far.

The poll, which was conducted June 8-10, does not include the effects of Sunday night's debate on the candidates' numbers.

The second debate, which was less formal than the one held on May 6, took place in the western city of Guadalajara.

Vazquez Mota tried to score points against Peña Nieto and Lopez Obrador, both of whom showed little interest in engaging in a slugfest.

Peña Nieto and Lopez Obrador used the debate to lay out their positions on various issues, often ignoring the topic being discussed.

The two men kept repeating the ideas they have been promoting since the campaign started in late March.

Vazquez Mota, who appeared tense and glared at the camera several times, said Peña Nieto "represents authoritarianism" and belonged to a party that tolerates corruption.

The PAN candidate accused Lopez Obrador, of the Party of the Democratic Revolution, or PRD, of representing "intolerance, resentment and confrontation."

Vazquez Mota has stepped up her attacks on Lopez Obrador since he grabbed the No. 2 spot in the polls from her.

Peña Nieto and Lopez Obrador ignored most of the charges leveled by Vazquez Mota and paid no attention whatsoever to Quadri, who appeared confused at times and consulted his rivals about his own campaign positions.

Consulta Mitofsky said it would release its next poll on Thursday.

Mexico will hold its presidential election on July 1, selecting a successor to President Felipe Calderon.

Nearly 80 million Mexicans will be eligible to vote for a new president, 628 legislators and thousands of other officials in the general elections. EFE