The Voter Participation Center and the Center for Voter Information are expanding their work in an effort to get more eligible but unregistered Americans at the voting booth. (StateScoop)- Two nonprofit, nonpartisan voting-rights organizations are expanding their efforts to register more voters, using data from public and commercial sources to target their work. Over the next two months, the groups, the Voter Participation Center and the Center for Voter Information, said they will send vote...