advantage with a 9 point lead over trump, bernie sanders is ahead by 7, elizabeth warren by 5 and kamala harris leads by a single point and the reason biden does so well in the poll is he beats trump with independent and suburban voters while the other three democrats either tied trump or narrowly lost with those groups and today was a busy one in iowa though, ten democratic candidate s spoke in cedar rapids including mayor pete buttigieg whose trying to win over independents and conservatives particularly in the midwest. >> heartland values don't have to lead you into the arms of the republican party especially this republican party. that claims the freedom, the talks about national security not any more. reporter: one issue nearly the entire democratic field responded today was president trump's tweeting urging progressive congresswoman to go back to the countries they came