SACRAMENTO, Calif. — California, a U.S. trendsetter for progressive policies and a state where the current governor once made news issuing marriage licenses to same-sex couples in San Francisco before it was legal, will attempt to enshrine marriage equality in the state constitution.The effort comes 15 years after a voter-approved initiative, called Proposition 8, banned the state from recognizing same-sex marriages. In 2013, the U.S. Supreme Court cleared the way for same-sex marriage in California. The …