The Power of the Postcard in Rocking the Vote | CDCE l Center for Democracy and Civic Engagementcdce.umd.edu Encouraging more eligible voters to register and participate in elections could be as simple as mailing them a postcard, finds new research led by the University of Maryland Department of Government and Politics. In a study published in Political Behavior, Professor Michael Hanmer and colleagues examined an effort in Pennsylvania ahead of the 2016 presidential election.