Talk about a jam-packed carry-on. Emmy-winning West Wing creator Aaron Sorkin — who was arrested at a Los Angeles area airport earlier this month on suspicion of carrying hallucinogenic mushrooms — was charged Monday with possessing not only 'shrooms, but rock cocaine and marijuana as well. The 39-year-old producer-writer is due to be arraigned today. Meanwhile, Robert Downey Jr.'s court hearing on drug charges stemming from his November arrest has been postponed until May 24 because the Ally McBeal star is in detox following his latest arrest last week.