Decades of research have established the direct influence of partisanship on voter perception of a host of real-world conditions. Even so, numerous factors have been found to moderate this "partisan bias." We examine one plausible moderator: the volume of perceptually relevant information that is available in the mass media. Both dissonance-theoretic and motivated-reasoning formulations of partisan bias in political perception suggest that the availability of perceptually relevant information may constrain perceptual bias. Yet this proposition has rarely been investigated systematically. This article investigates the moderation of partisan bias by informational conditions, focusing on the impact of economic news on economic perceptions during five Canadian general elections (1993-2006). Although the overall pattern is mixed, evidence suggests that bias reduction in response to information depends on the broader economic and political context.