The polls were right if one read them correctly.

Yet even you were surprised when Hillary lost.

So it appears to me that polls are best read after the fact as they are essentially unreadable beforehand.

They do offer some insight though. You'll note that I'm not claiming Beto is going to make a come from behind surprise victory or that Amy Klobuchar is a dark horse just waiting to make her move. Warren has been steadily climbing, Sanders going nowhere, and Joe riding the Obama coattails.
Good coffee, good weed, and time on my hands...