Mexico's leftist presidential candidate has accused Mexican businesses of financing a campaign to discredit him.
Andres Manuel Lopez Obrador says companies funded a series of television advertisements during the campaign season that he says contained subliminal messages to undermine his candidacy.
The allegations come as thousands of Lopez Obrador's supporters are converging on the capital to demand a ballot-by-ballot recount of this month's election.
Lopez Obrador has called for a mass protest in Mexico City's Zocalo Square this Sunday.
He has rejected official election results that gave a razor-thin victory to conservative Felipe Calderon. He alleges the July second ballot was marred by widespread fraud.
Lopez Obrador's Democratic Revolution Party has said Wednesday more than 40,000 people had begun their journeys to the capital ahead of the rally. Protesters are arriving by truck, horse and on foot.
Calderon denies accusations of election fraud and has appealed for calm.
Lopez Obrador's supporters have said they have evidence of election fraud, including videos they say shows a person stuffing votes into a ballot box in the state of Guanajuato.
Lopez Obrador's staff has said street protests will continue indefinitely. This past Saturday, more than 100,000 demonstrators gathered in the capital.
Mexico's electoral tribunal has until September sixth to rule on Lopez Obrador's challenge and officially announce the winner of the election.
Calderon has already begun to assemble his presidential staff.