Bob Arnot, the medical doctor turned foreign correspondent for MSNBC and NBC News—the onetime chief medical correspondent "Dr. Bob" on NBC News, who has been filing prickly, Geraldo-like dispatches from Iraq—has been conspicuously absent from TV lately. Dr. Arnot’s contract was up at NBC in December 2003 and, according to the network, won’t be renewed in the foreseeable future. Dr. Arnot did not leave willingly. Although personal, his departure has also exposed the divides over TV coverage of the war in Iraq. In a 1,300-word e-mail to NBC News president Neal Shapiro, written in December 2003 and obtained by NYTV,...