'O Brother Where Art Thou?'; Mark Cuban; Stephen Gaghan

Filmmakers Joel Coen and Ethan Coen and actors George Clooney, John Turturro, and Tim Blake Nelson talk about their movie, "O Brother Where Art Thou?" Mark Cuban, co-founder of Broadcast.com, on entrepreneurship and buying the NBA's Dallas Mavericks. Stephen Gaghan on his screenplay for the film "Traffic."