 There appears to be a power struggle at the top of the Democratic Party over what to do next. Pick a replacement at next month's convention or select one virtually really soon. Vice President Harris has not guaranteed the nomination and will have to earn the required delegates. She has endorsements from Biden and other Democrats, including Bill and Hillary Clinton. Another big advantage for Harris, she would be able to use the money already raised by Biden's campaign committee. Texas Congressman Joaquin Castro on ABC News.