We have known this for years but still is seems to surprise people when they read it. Hillary Clinton herself stated during President Bush’s term that dissent is patriotic but we know what she meant. Only dissent from the left towards the right is acceptable.
Here is a blog with the following headline, Why Liberals Hate Freedom of Speech. but before that it has this:
It’s time to stop playing games with the Left. It’s time to crush them under the weight of truth and reason.