"We have a very robust group of election lawyers and good-government groups who carefully monitor changes in election procedures," he said.
The voters themselves and third party observers would ensure election integrity, and a group of election officials, called trustees, would protect ballot secrecy.
"Millions of Pakistanis took a leap of faith Monday by showing up at the polls," said James Moody, who led an American group of election observers.
A group of election administrators, fair-voting advocates and computer experts wrote to Attorney General Eric Holder Jr. recently to warn of the dangers if the deal closes.
Last month, the most prominent international group of election monitors — experts who work for the Organization for Security and Cooperation in Europe — abandoned plans to observe the vote, citing Russian restrictions that made their work impossible.
Raising more questions about the results, the leading international group of election monitors scrapped plans to observe the vote, citing what it called onerous restrictions imposed by the Russian government.
Despite the American optimism, an international group of election monitors affiliated with the Democratic Party warned today that Mexican politicians, especially those in Mr. Zedillo's party, may be using federal assistance programs to curry favor with voters.
This relatively accurate polling data provided the raw material for the second group of election pioneers: poll analysts like Nate Silver, who writes the FiveThirtyEight blog for The New York Times, as well as Simon Jackman at Stanford, Sam Wang at Princeton and Drew Linzer at Emory University.
The largest group of election observers described the vote as "seriously compromised" and said up to a million Zimbabweans were prevented from voting.
