Barack Obama, the US president, has reiterated his administration's support for Mexico's fight against drug traffickers in a phone call to its president.br br Violence along the US-Mexico border has skyrocketed since Felipe Calderon, the president of Mexico, sent government troops to confront the drug cartels.br br Now there is a growing feeling that the military strategy has been counter-productive.br br Al Jazeera's Mariana Sanchez reports.