Hillygus D. Sunshine. The Persuadable Voter : Wedge Issues In Presidential Campaigns / D. Sunshine Hillygus And Todd G. Shields. - Princeton : Princeton University Press C2008. - XV 249 P. : ILL. 25 CM. - 0 . ENG ISBN: 9780691133416 (Hardcover : Alk. Paper) 0691133417 (Hardcover : Alk. Paper)