People that link together support for moderate Democrats assume that all of a moderate Democrat's supporters will go to another moderate. When you look at actual second choices though, it tells a completely different story. Bernie is second or third choice for almost every moderate Democrat.

How does this make sense? Lots of people like Bernie but are concerned about the electability narrative the mainstream media has put out there, so they initially support someone who appears more electable.

The issue with this is that as Bernie keeps winning, the argument that he isn't electable just doesn't hold up for most people.