For this study of the relationships between accuracy of political information and attention to various mass-media sources of public-affairs information, personal interviews were conducted with 388 eligible voters in Madison, Wisconsin, and 129 eligible voters in Lexington, Kentucky, during October 1972. Variables measured included education, political interest, campaign interest in the 1972 presidential campaign, public-affairs mass-media usage, knowledge of the political system, and ability to identify the major-party candidates' positions on major issues. Results supported four general conclusions: (1) Network news viewing has no discernible impact on either political accuracy or political system knowledge of first-time or older voters. (2) Public-affairs newspaper use has an independent effect on both accuracy and political system knowledge for young, inexperienced voters but not for older voters. (3) Public-affairs magazine use affects accuracy but not political system knowledge, for both age groups. (4) Interest in the campaign predicts accuracy for first-time voters only. (AA)