This study investigates how an interviewer's characteristics affect how respondents answer survey questions about democracy and political engagement. I analyze data from the 2008 Afrobarometer surveys, in which 810 interviewers surveyed 27,713 respondents across 20 countries in sub-Saharan Africa. Using these data, I study how interviewer education, age, and gender affect two outcomes: (1) response distributions to attitudinal and behavioral survey questions and (2) the likelihood of respondents saying 'don't know' to a survey question. The analysis also investigates how the respondent's perception of who sponsored the survey (NGO, private sector, government) affects attitudes. The results show that these interviewer characteristics affect the quality of survey data on political attitudes and behaviors. In the discussion, I consider the implications for research based on public opinion data about democracy and political engagement.