The book is Presidential Campaign Posters: Two Hundred Years of Election Art by W. Ralph Eubanks, publishing director at the Library of Congress. You can hear an interview with Eubanks below, and browse through some of the posters here and here.

[caption id="attachment_1032" align="aligncenter" width="300"] Photo credit: Library of Congress[/caption]

[caption id="attachment_1033" align="aligncenter" width="286"] Photo credit: Library of Congress[/caption]

[audio http://www.podtrac.com/pts/redirect.mp3/audio.wnyc.org/bl/bl051612bpod.mp3]