text:  Live from NPR News in Washington, I'm Lakshmi Singh. The Biden re-election campaign has returned to the campaign trail under a greater sense of urgency within the Democratic Party. The next stop for the president is Detroit. He says he intends to keep running for a second term because he still has work to finish. But so far, Biden has yet to halt the growing wave of allies worried about his cognitive abilities and his chances for beating former President Donald Trump in November.