A woman casts her ballot during state elections in the town of Puerto Aventuras in Quintana Roo state, Mexico, Sunday July 4, 2010. A dozen Mexican states held elections Sunday after campaigning besieged by assassinations and scandals that have showcased the drug cartels' power, like in Quintana Roo where one of the main candidates for governor was arrested last month on charges of protecting two cartels. (AP Photo/Israel Leal)

Photo by: Israel Leal

A woman casts her ballot during state elections in the town of Puerto Aventuras in Quintana Roo state, Mexico, Sunday July 4, 2010. A dozen Mexican states held elections Sunday after campaigning besieged by assassinations and scandals that have showcased the drug cartels' power, like in Quintana Roo where one of the main candidates for governor was arrested last month on charges of protecting two cartels. (AP Photo/Israel Leal)