From the NY Times article on the dedication of the Clinton Presidential Library:
Laura Bush, in a bright fuchsia coat, and her mother-in-law, Barbara, in a sensible raincoat, allowed Mrs. Clinton and Rosalynn Carter to precede them to the podium. The band then struck up "Hail to the Chief" and their husbands emerged, with President Bush squeezing past Mr. Clinton out the glass doors of the library and Mr. Clinton giving him deference with a guiding hand at his back. Jimmy Carter and the first President Bush followed.
