In response to an article by Melody Petersen in the New York Times, "CNN said yesterday that Aaron Brown, its nighttime news anchor, would not go forward with plans to become host of a series of corporate-sponsored videos that look like news and are broadcast on public television stations. ... A Boca Raton, Fla., production company, WJMK, recently hired Mr. Brown and Walter Cronkite, the former CBS News anchor, to serve as the hosts of a program called the American Medical Review.