B ecause television is the sole source of national and world news for many Americans, the of television news coverage of the Vietnam war is a question of tremendous national importance. Nielson ratings show that over 35 million TV sets are tuned to evening news shows each night. Polls conducted in 1959, 1961, 1963, 1964, and 1967 by Elmo Roper and Associates indicate not only that TV is the primary source of news for most Americans, but that it has widened its lead over the other media as being the most believable source. Not only is the power of television enormous, but the broadcast industry is oligopolistic: Viewers must choose among three networks, and in some cases only two. For all these reasons, the question whether TV news coverage is biased assumes tremendous significance, and claims of bias in reporting of the Vietnam war have been made by opponents as well as supporters of that war. It is beyond the scope of this study to determine what fair coverage actually is; this is a matter for normative judgment. What this study does attempt to measure is how successful and worthwhile the Nixon Administration's Vietnam policy was made to appear through TV coverage in the 1969 and 1970 national evening newscasts. The concept of is key to the study. It was defined as that quality of statements of opinion or of actual or supposed fact that would influence one to support or oppose a President or his policy. The veracity of a given statement is thus independent of its as defined above, and a neutral rating on the scale measuring bias (which will be discussed later) is not ipso facto desirable,