Such victories politically benefit President Felipe Calderon, who declared war on the drug cartels shortly after he came to office in December 2006.

VOA: standard.2009.06.09

The war on drug cartels declared by Mr Calderon after his election in 2006 is seen as having led to a surge in drug-related violence.

BBC: Mexico estimates 26,000 missing since 2006

Meanwhile, the man who was declared the winner, conservative Felipe Calderon, says he is the president-elect.

NPR: Obrador Supporters Cry Fraud in Mexican Election

This morning, they've woken up and Felipe Calderon is winning once again, and he probably will be declared the winner.

NPR: Calderon Holds Lead in Mexican Vote Recount