Opposition candidate Andres Manuel Lopez Obrador claims Mexico recent presidential election was fraudulent and refused to concede to the victor, Institutional Revolutionary Party (PRI) candidate Enrique Pena Nieto . . . Lopez Obrador called the election a “filthy national embarrassment,” accusing the PRI of buying votes and breaking limits on campaign spending . . . the leftist leader said he will provide proof of his allegations and challenge the result . . . Lopez Obrador of the Democratic Revolution won 31 percent of the vote to Pena Nieto’s 38 percent . . . protests by supporters of Lopez Obrador paralyzed Mexico City for more than a month after he lost the 2006 election by a very slim margin . . . the PRI, which held office for 70 years, has a reputation for vote-rigging and manipulation, but there are no indications of irregularities in this election and claims by Lopez Obrador likely will not spark the massive demonstrations of 2006.