Iowa: Sanders and the Field

Iowa Democrats have been shifting positions among candidates for months and the final caucus polls reach no consensus, except Bernie Sanders is ahead with about a quarter of the vote. But, the field after him varies by poll and timing. Does it reflect real change or just an artifact of the polls?

In the last four polls, Joe Biden is in first place in one, one tie for first, but he’s in third place in one. Elizabeth Warren has fallen back since December, but is ahead of Biden in one poll. Pete Buttigieg is now in third, but close, and Amy Klobuchar has moved up and is in fourth place. Who wins the first sprint?