 Live from NPR News, I'm Dale Willman. President Biden is campaigning in Pennsylvania today. As NPR's Tamara Keith reports, he appears to be responding to critics wanting him to stop his campaign with a call to action for his supporters. While top congressional Democrats were meeting to discuss whether President Biden has what it takes to beat former President Trump in November, Biden was campaigning like a man with something to prove, shaking hands and taking selfies for a long time at three separate stops.