Look at FDR’s rhetoric in response to the Great Depression. He rode that wave into the White House. (By the way, Sanders likes to tweet both FDR and TR.)
I have read the “Roosevelt Myth” by Joseph Flynn which I would recommend reading. Flynn covered Roosevelt from 1932 till 1945 and wrote the unvarnished truth about Roosevelt and his Policies. Yes I agree his rhetoric and polices in the 1930’s were the foundation of the Welfare State and a great deal of the so called “Brain Trust” were academics who were Socialists and even Communists. But I believe that Sanders, Hillary and that ILK really go further than even some of those in the 1930’s. These people seem to feel there is no limit to the amount of Government that should be in our lives and Sanders unlike Hillary frankly admits to being a Socialist and a Anti-Capitalist. The Anti-Business crowd of the 1930’s ain’t got nothing compared to this bunch.