Acclaimed actor Don Cheadle is making his Broadway debut in Proof, the new revival of David Auburn's play. With the actor now treading the Booth Theatre eight shows a week, there are plenty of opportunities for esteemed guests to see the show, including producers Barack and Michelle Obama. But don't tell Cheadle who might be in the audience. "I don't want to know," the actor told Stephen Colbert during a recent vi…
