Yes! Political scientists have conducted dozens of experiments on the effect of direct mail and find that, on average, mailers increase turnout when they use “messages that emphasize civic duty or the importance of making one’s voice heard” (see Get Out the Vote: How to Increase Voter Turnout by Donald Gerber and Alan Green, 2015, pg. 58). Additional evidence also shows that making the interaction feel personalized, rather than just a blanket message from an organization, is key to increasing the effectiveness of voter outreach.