A SHIFTING TIDE?Never let the facts get in the way of a good narrativehttp://tpmmuckraker.talkingpointsmemo.com/2010/07/right-wingers_stand_by_their_fabricated_mexican_dr.phpAccording to anonymously-sourced reports pushed by right-wing blogs last weekend, members of Mexico's notorious Zetas drug gang crossed the border into Texas and, "in what could be deemed an act of war," seized two ranches