Polls have opened in Guatemala for voters to choose their next President. Former army General Otto Perez Molina of the right-wing Patriotic Party appears to be the front runner in a field of 10 candidates. Mr. Perez Molina who has promised to be tough on crime would need more than 50% of the votes to avoid a run-off vote in November.Whoever wins will face the challenge of rising violence much of which is attributed to local and Mexican gangs. Mexican cartels have expanded operations into the Central American nation which is an important transit point for drugs smuggled from South America to the United States.