President Bush kisses Barbara during a pre-election rally at the Astro Arena in Houston on Nov. 2, 1992.

President George Bush kisses his wife Barbara during a pre-election rally at the Astro Arena in Houston on Nov. 2, 1992. A new book of letters between presidents and wives, based on the papers of 23 presidents held by the Library of Congress, fleshes out momentous periods of history with the full range of human emotion.