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Joseph Rodgers, 18, left, a high school senior from Pittsburgh, Pa., wears a "I am ready for Hillary" button as he waits to meet HiIlary Clinton at a book signing her new book "Hard Choices," on Tuesday June 10, 2014, at Barnes and Noble bookstore in New York. Clinton said Tuesday that she and former President Bill Clinton "fully appreciate how hard life is for so many Americans," seeking to refine remarks she made about the pair being broke when they left the White House while on a high-profile media tour for a new book. (AP Photo/Bebeto Matthews) ( Hillary Clinton )

Sean Brennan, far left, chats with HiIlary Rodham Clinton, center, before receiving a signed copy of her new book "Hard Choices," on Tuesday June 10, 2014, at Barnes and Noble bookstore in New York. Brennan, 41 from Queens, N.Y., was first in line to meet Clinton, spending the night after arriving 2:30 p.m. yesterday. "I like Hillary Clinton," said Brennan. "There aren't many people worth coming out for twenty four hours before hand to see, but she is one of them." (AP Photo/Bebeto Matthews) ( Hillary Clinton )

HiIlary Rodham Clinton reacts to cheers as she arrives for a book signing on Tuesday June 10, 2014, at Barnes and Noble bookstore in New York. (AP Photo/Bebeto Matthews) ( Hillary Clinton )

Former Secretary of State Hillary Clinton meets with people during a book signing for her new book, "Hard Choices" at a Barnes & Noble on June 10, 2014 in New York City. (Photo by Andrew Burton/Getty Images) ( 450381608 )

Former Secretary of State Hillary Clinton meets with people during a book signing for her new book, "Hard Choices" at a Barnes & Noble on June 10, 2014 in New York City. (Photo by Andrew Burton/Getty Images) ( 450381616 )

Former Secretary of State Hillary Clinton poses with her new book, "Hard Choices" during a book signing at a Barnes & Noble on June 10, 2014 in New York City. (Photo by Andrew Burton/Getty Images) ( 450381996 )

Copies of former Secretary of State Hillary Clinton's new book "Hard Choices" sit at a Barnes & Noble prior to a book signing on June 10, 2014 in New York City. (Photo by Andrew Burton/Getty Images) ( 450382004 )

Former Secretary of State Hillary Clinton speaks to a crowd during a book signing for her new book, "Hard Choices" at a Barnes & Noble on June 10, 2014 in New York City. (Photo by Andrew Burton/Getty Images) ( 450382026 )

A woman waits in line to meet former Secretary of State Hillary Clinton during a book signing for Clinton's new book "Hard Choices" at a Barnes & Noble on June 10, 2014 in New York City. (Photo by Andrew Burton/Getty Images) ( 450382028 )

HiIlary Rodham Clinton speaks before doing a book signing on Tuesday June 10, 2014, at Barnes and Noble bookstore in New York. (AP Photo/Bebeto Matthews) ( Hillary Clinton )

HiIlary Rodham Clinton listens before signing a copy of her book on Tuesday June 10, 2014, at Barnes and Noble bookstore in New York. (AP Photo/Bebeto Matthews) ( Hillary Clinton )

HiIlary Rodham Clinton listens before signing a copy of her book, "Hard Choices" on Tuesday June 10, 2014, at Barnes and Noble bookstore in New York. (AP Photo/Bebeto Matthews) ( Hillary Clinton )

HiIlary Rodham Clinton, right, listens before signing a copy of her new book for a wheelchair-bound woman on Tuesday June 10, 2014, at Barnes and Noble bookstore in New York. (AP Photo/Bebeto Matthews) ( APTOPIX Hillary Clinton )

Joseph Rodgers, 18, left, a high school senior from Pittsburgh, Pa., chats with HiIlary Clinton, center, before receiving a signed copy of her new book "Hard Choices," on Tuesday June 10, 2014, at Barnes and Noble bookstore in New York. (AP Photo/Bebeto Matthews) ( Hillary Clinton )

In this photo provided by the American Broadcasting Companies, Inc., former Secretary of State Hillary Rodham Clinton, right, discusses her new memoir, "Hard Choices" with Robin Roberts during a live interview with Roberts on the ABC Television Network's "Good Morning America," Tuesday, June 10, 2014 in New York. (AP Photo/ABC, Ida Mae Astute) ( Hillary Clinton )

A bus passes in front of a Barnes & Noble Bookseller store where former US Secretary of State Hillary Clinton greeted patrons for the signing of her new book, "Hard Choices" on June 10, 2014, in New York. BRIGITTE DUSSEAU/AFP/Getty Images ( 530578535 )

Copies of former US Secretary of State Hillary Clinton's new book, "Hard Choices" are viewed for sale at the Barnes & Noble Booksellers store June 10, 2014, in Fairfax, Virginia. AFP PHOTO/Paul J. RICHARDS/AFP/Getty Images ( 530574309 )