hschupak@cahners.com Edward R. Murrow must be spinning in his grave. What would the legendary CBS journalist—who set the standard for excellence in broadcast journalism—have said about the conflict diamonds segment of the network's Feb. 18 episode of 60 Minutes ? The segment, better suited to a supermarket tabloid than a so-called respectable newsmagazine, was rife with opinion and half-truths unabashedly spin-doctored and presented as "facts." (For a detailed report about the program's content, please turn to Up Front, page 23.) Murrow, who reported on the London blitz from ground zero during World War II, chronicled the plight of migrant farm workers in the seemingly prosperous America of 1960, and exposed the two faces of vigilante senator Joseph McCarthy, was and still is regarded as the ultimate broadcast journalist. But as the 1960s progressed, he grew increasingly