I found this polling outfit from Wikipedia. They have a page that lists Democratic primary polls, and it’s a little bit more expansive that what you find on Real Clear Politics.
The Wikipedia link is here, if anyone is interested.
One of the outfits they include that RCP doesn’t is Overtime Politics. I had never heard of them before, and can’t say anything about them except that they’ve done a lot of statewide polling I hadn’t seen before. Since I think they’re fairly new, their reliability remains an open question.
They polled IA 1/28 and 1/29 and have Bernie up by 1. The link is here.
Bernie is up by 4% among whites overall, but the Ns for other races are very small.
We will all find out tomorrow.