Supporters of Mexico's two main opposition parties, the the conservative National Action Party, or PAN, and the leftist Party of the Democratic Revolution, or PRD, want the Pact for Mexico to continue despite the differences that emerged with the Peña Nieto administration following the recent elections, a poll released Monday says.

The poll, which was conducted by Beltran, Juarez y Asociados, or BGC, and published by the daily Excelsior, found that 57 percent of respondents said there were "many irregularities and fraud" during the July 7 state and local elections.

Some 67 percent of PAN supporters said the conservative party should remain in the Pact for Mexico, a roadmap for the structural reforms needed in the country, while 63 percent of PRD backers took the same position.

The pact, which was signed on Dec. 2 by the PAN, the PRD, the governing Institutional Revolutionary Party, or PRI, and President Enrique Peña Nieto's administration, includes more than 100 commitments to the main reforms needed in Mexico.

Both the PRD and the PAN, however, warned during the recent election campaign that the political deal was unraveling and might collapse if the federal government or PRI governors gave favorable treatment to the governing party's candidates in the election.

Some 45 percent of respondents, both PAN and PRD supporters, said the parties "do not have a reason" to scuttle the pact, while 39 percent took the opposite position.

The PAN and PRD formed coalitions in some states, such as Baja California, to compete for office.

Some 48 percent of respondents said the Peña Nieto administration tried to favor its candidates, while 37 percent took the opposite position.

The PAN and PRD said Sunday that they would remain in the Pact for Mexico only if and "exhaustive" investigation was conducted of the irregularities reported in the 14 states where elections took place.

PAN chairman Gustavo Madero and his counterpart from the PRD, Jesus Zambrano, said in a press conference that the elections were a reminder of the worst practices during the PRI's seven decades of rule from 1929 to 2000. EFE