This study addresses the changing role of Internet usage on the political knowledge and participation gap between individuals of low and high socioeconomic status (SES). Analysis of data collected by the Pew Research Center's Biennial Media Consumption Studies (1998–2012) shows that the percentage of the population that accidentally encounters political information online has risen dramatically. Results show that accidental exposure and SES are positively related to political knowledge, and that accidental exposure reduces the SES knowledge gap. Moreover, accidental exposure appears to be mitigating the SES voting gap at an increasing rate over time.