 This is CBS News on the Hour, sponsored by Dr. Marty's Nature's Blend dog food. I'm Steve Kathan. For Republicans, it's full speed ahead with Donald Trump. For Democrats, there are speed bumps. For President Biden, his questions swirl about his viability as a standard bearer. CBS's Weijia Jiang reports a planned DNC virtual roll call to anoint Biden won't be attempted until early next month.