Great assessment by Newsweek:
With the Proposition 8 fight, Obama has fallen short in a different way, by his reluctance to join an emerging social consensus. Obama had previously criticized California’s Proposition 8, the ballot initiative banning same-sex marriage, as “divisive.” But his official position — which no one believes he actually holds — is that he is against legalizing gay marriage. Americans are changing their views on this issue with inspiring rapidity. Judge Vaughn Walker’s moving opinion provided an occasion for Obama to embrace the extension of equal rights to gay people. Instead, he slunk mumbling in the other direction. How dismal that America’s first black president will be remembered as shirking the last great civil-rights struggle.
The entire story can be read, if you click these magic, highlighted words.