SAN FRANCISCO — The California attorney general has changed his position on the state’s new same-sex marriage ban and is now urging the state Supreme Court to void Proposition 8.

The sponsors of Proposition 8 asked the California Supreme Court on Friday to nullify the marriages of the estimated 18,000 same-sex couples who exchanged vows before voters approved the ballot initiative that outlawed gay unions.

Gay rights advocates are criticizing President-elect Barack Obama‘s choice of a popular evangelical minister to deliver the invocation at his inauguration, saying it shows disrespect for a constituency that strongly supported his campaign.