MEXICO CITY -- As if Mexicans needed more evidence that criminal groups are trying to hijack the political life of the nation, it came with a ferocious triple-whammy punch in the past 24 hours. Assailants shot and seriously wounded the mayor-elect of a town in the border state of Chihuahua on Friday afternoon, less than a day after commandos in Nuevo Leon state executed a sitting mayor, making him the 10th municipal chief slain so far this year. In Mexico City, a fugitive legislator with drug charges pending against him sneaked into Congress and took his seat, automatically obtaining immunity...