Why we don’t really know who is ahead in Iowa right now

Poll of the week: There’s no poll of the week because there’s been a dearth of polling for the all-important Iowa Democratic caucuses. …

Iowa’s a little more than a month away, and we don’t really know who is ahead, let alone who is going to win. Our lack of knowledge is for two reasons: a lack of polling and the polls that we do have show a close race at the top. CONT.

Harry Enten, CNN