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I think [my grandchildren] will be proud of two things. What I did for the Negro and seeing it through in Vietnam for all of Asia. The Negro cost me 15 points in the polls and Vietnam cost me 20. Lyndon B. Johnson With tenacious regularity over the last two and a half decades the Gallup Poll has posed to its cross-section samples of the American public the following query, “Do you approve or disapprove of the way (the incumbent) is handling his job as President?” The responses to this curious question form an index known as “Presidential popularity.” According to Richard Neustadt, the index is “widely taken to approximate reality” in Washington and reports about its behavior are “very widely read” there, including, the quotation above would suggest, the highest circles. Plotted over time, the index forms probably the longest continuous trend line in polling history. This study seeks to analyze the behavior of this line for the period from the beginning of the Truman administration in 1945 to the end of the Johnson administration in January 1969 during which time the popularity question was asked some 300 times. Four variables are used as predictors of a President's popularity. These include a measure of the length of time the incumbent has been in office as well as variables which attempt to estimate the influence on his rating of major international events, economic slump and war. To assess the independent impact of each of these variables as they interact in association with Presidential popularity, multiple regression analysis is used as the basic analytic technique.