 I'm Deborah Rodriguez. President Biden will spend today trying to assure members of his own party he's still the best person to take on Donald Trump in the November election. Vice President Harris tells CBS News... Joe Biden is our nominee. We beat Trump once, and we're going to beat him again. Period. Texas, Lloyd Doggett's become the first sitting Democrat in Congress to publicly call on Mr. Biden to bow out. Our just-released CBS News poll shows more Americans may be feeling the same way.