THORNTON, Colo. (CBS4) ― A well known restaurant owner, who has fed President Bush, senators, governors and mayors, is the target of a federal drug investigation in connection with what Drug Enforcement Administration agents call "a large scale Asian marijuana cultivation organization." Dan Tang, owner of Heaven Dragon restaurant in Thornton, told CBS4 reporter Brian Maass federal drug agents are "investigating me." But he denied involvement in the pot growing operation. Tang's lawyers, Michael Axt and Gene Ciancio, emphasized that Tang has not been charged with a crime but they declined to make further comment on the case. According to...