What marriage?
I think he was meaning the Dunham-Obama marriage that is listed in the 1960-1965 Hawaii Index of Marriages and the one that was granted a divorce decree on March 20, 1964.
The divorce decree states: “That Libellant and Libellee were lawfully married in Wailuku, Maui, state of Hawaii on February 2, 1961 by a person
Duly authorized to perform marriage ceremonies and since that date have been and are now husband and wife.”
http://www.scribd.com/mobile/doc/12234409