Purge

This TPM post is an excellent overview of What It's All About.

Winger talking points are focusing around the fact that USA's serve at the pleasure of the president; that he can fire them at any time, for any reason. And for the most part that's correct.

However, as Marshall puts it in that post: "The firings were not the offense. They were the clue that suggested the offense."

There's more; I suggest you read the post in its entirity.