Former Secretary of State Hillary Clinton speaks to a crowd during a book signing for her new book, Hard Choices. Clinton's book tour has brought her before admiring audiences, but also highlighted her difficulty talking about her wealth and her presidential vision. Andrew Burton/Getty Images hide caption

itoggle caption Andrew Burton/Getty Images

An official assists a voter at a polling station inside Fort Garrison Elementary School in Pikesville, Md., on primary day, June 24. As in many states this primary election season, turnout was low in Maryland. Patrick Semansky/AP hide caption

itoggle caption Patrick Semansky/AP