Millions of US voters lack access to documents to prove citizenship

If asked to quickly locate a passport, birth certificate or naturalization papers to produce proof of citizenship tomorrow, more than 21 million Americans – about 9% of eligible voters – would not be able to, according to the survey, conducted by the Brennan Center for Justice, VoteRiders, Public Wise, and the Center for Democracy and Civic Engagement (CDCE) at the University of Maryland.