CBS flush with new ideas for PSA Network promotes colonoscopy sweepstakes By MICHAEL SCHNEIDER CBS is promoting a colonoscopy sweepstakes in primetime. As part of its CBS Cares public service initiative, the network is offering a four-night stay in New York to one lucky winner. Oh — and a free colonoscopy, to be performed by Dr. Paul Miskovitz, a leading gastroenterologist and expert on colorectal cancer. The tongue-in-cheek (pun intended)