text:  Live from NPR News in Washington, I'm Nora Rahm. President Biden is to return to the campaign trail next week, although more Democrats are urging him to withdraw his bid for re-election. NPR's Windsor Johnston reports. Representatives Betty McCollum of Minnesota, Kathy Castor of Florida, and Gabe Vazquez of New Mexico are among the latest House Democrats to call on Biden to drop out of the race.