 at progressive.com. Not available in California or from all agents. This is NPR. From NPR and WBUR, I'm Vipa Fernandez in Alameda, California. And I'm Celeste Headley in Washington, D.C. It's Here and Now. The Biden campaign says it is not working through any scenarios where someone other than the president is at the top of the ticket. But the first Senate Democrat to call for Biden to bow out of the race says the pressure for Biden to leave is intensifying.