What Dan Guild found after analyzing decades of Iowa caucus polling from this point in the election cycle. -promoted by Laura Belin

For candidates struggling nationally, Iowa is the last, great hope.

I have been on campaigns like those. You draw hope from stories of conversion. A vice-chair of a town committee announces their support, or a canvasser talks to someone who just converted from the front-runner to you. You think, just another debate, or a new set of ads. Then one fine morning, a poll will show…