Yeah i've read Our Revolution and he's pretty clear about things in it. He would never have called himself a socialist if he wasnt one, it didnt help him or serve any strategic means. Bernie has a long history of supporting socialists around the world, what his platform as president was doesnt have much to do with his own personal ideologies, and theres a clear distinction between him and a liberal like Marianne. The difference is that yes social democracies have things that socialist countries can implements obviously, but Marianne looks to it as an end in it of itself while someone like Bernie looks at these things as part of the answer as opposed to the answer itself. I also dont think Bernie was great at articulating some things, though he was good at popularizing concepts related to socialist ideology.