Karen Gutermuth; The American Medical Political Action Committee: Which Senators Get the Money and Why?. J Health Polit Policy Law 1 April 1999; 24 (2): 357–382. doi: https://doi.org/10.1215/03616878-24-2-357
Previous research has heightened the debate over what motivates the American Medical Political Action Committee (AMPAC), the campaign financing arm of the American Medical Association (AMA). Analyses of roll call votes typically assume that vote-buying is the reason AMPAC contributes to members of Congress, a hypothesis consistent with the theory of economic regulation, but one that has seldom been tested empirically.