From the WSJ:
Her campaign spent more than $900,000 on polling in the quarter that ended June 30th; Mr. Sanders, $0.
Bernie doesn't need polling.
He speaks his mind and doesn't test where the wind is blowing. He's been saying the same thing for 40 years.... and now the wind is finally at his back.
Why poll when you are speaking the truth? There's no need to poll test the truth. No need for listening tours or focus groups.
Give 'em Hell Bernie!