text:  You know, he's long seen an opportunity. I would sort of be surprised if he challenged Kamala Harris directly. As you've seen in recent months, he has been one of the most steadfast surrogates for Biden, really going to his defense, even when there were these mounting calls for the president to step down. He and Harris have a long history. You know, when she became district attorney was the year he was elected mayor here in San Francisco.