Good question. The answer is: Apparently not. Early on during the primary season they want to be able to predict the winners. But I think many of them are really just a tool of the Left and doing what they can for the grand cause of getting their candidate, Hillary Clinton elected. They are there not to gauge the voting sentiments of the country but to influence the masses and the outcome. People like voting for winners. If her numbers are going down they will do what they can as part of the rat machine to prop her up. Any false predictions will be forgotten. Do you remember all the false predictions of the past and who made them? I certainly don't.
“People like voting for winners.”
That is the part I will NEVER grasp. I understand wanting to BET on a winner, there is money involved but I cannot even begin to fathom voting for someone you don’t prefer simply because you think they are going to win without your vote. To me that is as idiotic as a person can possibly be.