Voter turnout is crucial in electing a politically representative government, but turnout depends on many social norms as well as the likelihood of casting a pivotal vote. This column uses evidence from a campaign to increase turnout in the 2009 elections in Mozambique to examine how peer effects impact both these channels. The results reveal positive peer effects on information and interest in politics, but negative effects on voter participation, perhaps due to voters becoming aware that their vote is less likely to matter as overall turnout increases.