Yawn, we saw the same thing with Howard Dean.
Sanders has a more coherent message than Dean did, and is more credible on the stump. (There will be no “yeeerrrrauggggh!” from Bernie.) Philosophically Sanders wants to channel FDR, and is doing a pretty good job of it so far. He is selling socialism to huge base that has discovered they like the sound of it. He could very well win the nomination in the primaries, especially if Biden stays out. The Republicans need to start thinking about what it will be like if they wake up one morning and find they are running against a full-blown socialist populist.
Only this could be the 2015 version of George McGovern. Hillary’s overdue for a meltdown.