NEW 2020 Dem. poll from The Economist/YouGov: Warren pulls ahead of Sanders & into 2nd place (w/in margin of error). This wk & change vs last wk: Biden: 26% (-1) Warren: 16 (+5) Sanders: 12 (-4) Buttigieg: 8 (-1) Harris: 6 (-1) O'Rourke: 3 (+1) Typical caveat re: watch the avgs