Abstract Adults' use of newspapers is found to correlate positively with having reasons for preferring one U.S. senatorial candidate over another. Television exposure is negatively related to political reasoning to a nearly significant degree. Data were provided by a 1974 nationwide, postelection survey. Analysis was conducted at the aggregate level, examining media behavior and political knowledge in 67 news markets. News markets with competition among daily newspapers show greater levels of information than monopoly areas, controlling for education and interest in politics. Results suggest that a decline in newspaper penetration, lessened competition, or shift toward use of television for news would weaken peoples' understanding about partisan candidates.