New York, NY -- For the second year in a row, Oprah Winfrey tops the Forbes list of most influential celebrities. Nearly half the people surveyed rated Winfrey as influential. One point behind her is Steven Spielberg. Martin Scorsese is third, followed by Ron Howard and George Lucas. The rest of the top ten are Dr. Oz, Barbara Walters, Bono, Suze Orman and Clint Eastwood. Michael Fox falls from number two to number 13.