Chicken or egg?

A couple of days ago, I singled out Mike Huckabee for proposing the worst tax plan evah. This evening, I read this statement from kos:

There was a point in the YearlyKos presidential forum when Mike Gravel, asked to defend his ridiculous 23 percent national sales tax (on top of local and state sales taxes), grumpily responded with something along the lines of "Don't worry about the fair tax, it will never pass Congress."

My question to you, dear reader, is which of these jokers ripped off the other?