text:  But if he truly understands those stakes, he needs to act. Moulton joins two fellow House Democrats, one from Texas and another from Arizona, in calling for Biden to allow a different candidate to lead the ticket. For NPR News, I'm John Bender in Boston. Across the U.K., voting is underway as Britons are electing a parliament and prime minister. It's the first election there since Britain's exit from the European Union. From London, NPR's Lauren Freyer reports.