We still don't have an official result of the elections, the cause is simple: Andres Manuel Lopez Obrador has acussed everyone of massive fraud, including the loss of 3 million votes (the votes were indeed in the Prelimary Results Program, so this was completely disproved) and has threatned threatened with massive protests and said: "The stability of the country is at stake" (1). The prelimary results with 98.5 of the votes counted showed that PAN won by around 1% (around 400 000 votes), after counting the 3 million votes that are hold the PAN still wins by 0.6% (250 000 votes). With such a close election, has said Andres Manuel Lopez Obrador "The political stability of the country hangs in the balance." and it seems clear he simply won't accept his defeat soon.
This photo actually portraits very well my impressions of this protests, the placard says "fraud" next to the the latest elections since 1988 (actually the election of 1988 is widely regarded as fraudulent, and even one of the candidates died on suspicious circunstances after the election), despite since 1994 the IFE has organized the elections and all of them had been considered as valid by international organizations. The top of the placard acusses of the fraud the PAN, PRI (their principal competitors) and TV Azteca (this is completely ridiculous, despite it dubious antecedents I don't see how this TV network can alter the ballot boxes). I won't even comment about the URSS flag...
This is one of the worst scenarios, the PRD won't accept its defeat, and the stocks have already lost 4.3%. The IFE has decidied to recount every vote tallie.
As of 8:59 PM the results are PRD: 36.45 and PAN:34.83 but many districts in which PAN had most of the votes aren't counted yet. Wait, now at 9:15 are rumors the count has halted!!!
Update: The rumor was simply false and the stocks have been stable recently, this recount has actually showed the same results: in the preliminary results Calderón won by 0.6%, in the recount he won by 0.57%. Obrador has impugned the election and has treatened with more protests, has acussed the IFE of being a corrupt and fraudulent institution, called Vicente Fox a traitor to the country and even acussed his own representants of selling out. This will only affect his own political future, personally I just want him to shut up.