text:  Live from NPR News in Washington, I'm Lakshmi Singh. Several more congressional Democrats in the House and Senate are publicly urging President Biden today to withdraw from the presidential race. They include members of the Congressional Black Caucus, Congressional Hispanic Caucus, and the Progressive Caucus. Representatives Jared Huffman, Mark Vesey, Chuy Garcia, and Mark Pocan say widespread public concerns about Biden's age and fitness are jeopardizing what should be a winning campaign.