Barak Obama was never married to Stanley Ann Dunham.
There is no marriage license. There is no marriage certificate.
There was no announcement, no wedding, no preacher/imam, no guests, no bride’s maids, no ushers, no flower girl, no ring bearer, no wedding cake, and no pictures.
Michelle Obama has been quoted and captured on video saying, about Onbama’s mother, she was “very young and very single when she had him.”
http://www.theobamafile.com/_exhibits/VeryYoungVerySingleQuote.htm
There is no marriage license. There is no marriage certificate.
The Obama-Dunham divorce decree has been located and the divorce papers were in fact served on Barack Obama, Sr. and the divorce papers list a date for the marriage. It's not clear to me why Stanley Ann would have gone through this process and expense if she was not at least convinced herself that she was married.
Also why take the risk of involving the courts in a fraud? Also wouldn't either her lawyer or the courts have tried to locate her marriage license?
Also, if you look at the same website you linked to, you will see a note ("DoH Confirms Nuptual Record") saying that the State of Hawaii has in fact confirmed that the Obama-Dunham wedding IS listed in their marriage index. link