Not since Greta Garbo has there been a figure so famous whose voice remained a mystery to the American public. Chelsea Clinton, who has enjoyed complete media immunity for 2 decades following her move to the White House at age 12, and who had never granted a television or radio interview, launched her career as a TV talking head last night. At the top: on a NBC Network newsoid program called Rockcenter. Reviews are decidedly mixed. The Washington Post's Hank Stuever is dleightfully catty: It's no surprise whatsoever that Chelsea Clinton didn't electrify broadcast journalism with her debut Monday night on NBC's "Rock Center With Brian Williams," because she has no experience in broadcast journalism. She didn't cut her teeth with live coverage of strip-mall blazes in Sacramento. She never did weekend weather in Wichita Falls. She didn't blow the lid off mail-order ham scams in Des Moines. (Who - besides everyone working in TV news who did each and every one of those things - says you...(Read Full Post)