The world's most powerful person realized yesterday that membership does not always have its privileges. President Clinton's American Express card was denied Monday. He was attempting to purchase four books for $62.66 from Dolly's Books in Park City, UT. The President's AmEx card expired Sunday. Reportedly, a store clerk called American Express requesting manual approval after identifying the cardholder. The transaction was still denied. The President was forced to pay in cash for John Grishman's "The Testament"; Raymond Chandler's "Playback"; Octavia Paz's "In Light of India" and Stanley Wolpert's "India". The President was preparing to return to Washington following an Utah vacation.