"Birdman" cast describe acting on top of acting
Michael Keaton and the rest of the "Birdman (or The Unexpected Virtue of Ignorance)" ensemble cast -- which includes Emma Stone, Naomi Watts, Edward Norton, Zach Galifiankis, Amy Ryan and Andrea Riseborough -- sat down with CBS News' Ken Lombardi to discuss their new acclaimed Broadway-set drama from director Alejandro Gonzalez Inarritu ("21 Grams," "Babel").