He pretty much nails it:
Sanders is a lifelong government employee (like Hillary, Cruz, and Kasich). The self-declared socialist is an economically ignorant, hostile, mildly demented old man—the Democrats answer to John McCain. He gets traction by pushing the envy button effectively.
This works in a world where many are not only ignorant of economics but have a distorted set of moral principles and no respect for property rights, while some others are cynically exploiting the system to become super wealthy. The machine approves of his basic principles, which are like Obama’s. But he’s probably just a bit too rabid to win a general election in 2016. Obama got in because, unlike Bernie, he seems so reasonable and nice.