The 2020 Democratic field remains fiercely competitive. Sanders leads at 20%, but Warren is close behind at 17%, Buttigieg has fallen to 16% and Biden closes out the top four at 15%. The margin of error is +/- 3.7 percentage points. https://t.co/J1ynEPffRn

— Brianne Pfannenstiel (@brianneDMR) January 10, 2020