A 74-year-old woman tasked with opening envelopes sent by Miami-Dade County voters with their completed mail ballots was arrested Friday after co-workers caught her illegally marking ballots, resulting in an unknown but small number of fraudulent votes being cast for mayoral candidate Raquel Regalado. Investigators linked Gladys Coego, a temporary worker for the county elections department, to two fraudulent votes, but they suspect from witness testimony that she submitted several more.