Voting studies have reported a positive association between attention to the media and levels of knowledge about political events and that decided voters know more than do those who are undecided. The literature also indicates, on a less substantive basis, that vote switchers have lower levels of political knowledge than do those who do not switch candidates. Many studies, if not most, have used measures of political opinions, interest, or involvement as measures of knowledge; other studies have lacked clear-cut tests of the relationships. The present study employs reasons voters give for voting for or against specific candidates and reported voter perceptions of campaign issues as measures of political knowledge. Comparisons of the relationships between voting status and knowledge are made under two levels of attention to the campaign. The data were collected in a 1974 congressional campaign and the 1976 presidential campaign. The findings support earlier studies regarding the differences in knowledge levels between decided and undecided voters for both candidate and issue knowledge. However, no significant difference in candidate knowledge levels was found between switchers and non-switchers in either the congressional or the presidential campaign. Those who did not switch candidate preference in the 1976 campaign reported higher levels of issue knowledge than did those who switched candidate preference. The relationship between knowledge level and attention to the campaign via the mass media varied with voting status and campaign.