Wow. Now that's a demonstration!
Depicted on the image to the left[1] is just a scant few of the 2.4 million who were out demonstrating in Mexico this past Sunday.
They were out marching in favour of leftist presidential candidate Andrés Manuel López Obrador, who lost by 0.58% against right-wing conservative candidate Felipe Calderón a few weeks ago (López Obrador got 35.31% to Calderón's 35.89%, the difference being approximately 244,000 votes out of about 30 million votes cast between the two candidates, according to the official count). López Obrador has not accepted defeat, however, alleging irregularities in the voting process and hence demanding a recount. Florida 2000 anyone?
The outcome will ultimately be decided by a special tribunal called Tribunal Electoral del Poder Judicial de la Federación, whose primary purpose is deciding electoral disputes. Certifying the validity of the presidential elections also falls within its jurisdiction, and it's within the tribunal's discretion to order a recount or an entirely new election.
2.4 million. Mexico has about 107 million inhabitants, meaning approximately 2.2% of the entire Mexican population was out demonstrating. I wonder what, if anything, could inspire that kind of passion in 2% of the Finnish population...oh yeah, Lordi. Though, perhaps that's a sign of just how well off we are in Finland...or how bad things are in Mexico. Whoever ends up winning the elections certainly has his work cut out for him.
The Wikipedia entry has more information on the elections.
[1] Update: The picture was removed from the website I was linking to, so I removed it here as well.
