 Simulating software. Accelerating the pace of engineering and science. Learn more at mathworks.com. From NPR and WBUR Boston, I'm Celeste Headlee. I'm Deepa Fernandes. It's Here and Now. Coming up, weeks after President Biden's bad debate performance, we ask Vermont Senator Peter Welsh if he'd support Biden if he remains at the top of the Democratic presidential ticket. I would, but I think it's much better if he steps aside.