The ultimate liberal 'argument:' "You're stupid."

The subject was climate change, and Joe Biden- the poster child for political ADHD- has blurted out what most on the Left think is an argument for their side on almost any subject: "You're stupid."

Only it isn't an argument. It's an assertion. Moreover, it's an assertion people who are wrong can make just as easily as people who are right.

Why do liberals think that all they have to do is assert that they're right, and- voila!- it's beyond all doubt, even in the absence of logic?

HT: Drudge