CNBC's Kelly Evans is joined by Stanley Druckenmiller, founder of the Duquesne Family Office, to break down the market reaction to positive vaccine news from Pfizer, his outlook for the U.S. economy under a Biden presidency and more. It's a fantastic day for mankind, says Druckenmiller. Within 6-8 months we could be out of this mess. I think the market reaction is vary rational and very consistent, he adds.