While initially resisting pressure to reject Hagee's endorsement, McCain finally ended his relationship with Hagee when a sermon by the preacher describing the Holocaust as the will of God registered on the mainstream media's radar (Hear the now-infamous sermon here).

"Obviously, I find these remarks and others deeply offensive and indefensible, and I repudiate them. I did not know of them before Rev. Hagee's endorsement, and I feel I must reject his endorsement as well," McCain said on May 22.

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See Bruce's latest Hagee horror show

Lieberman was aware of many of Hagee's vile statements well before McCain renounced him. On May 13, Fox News' Megyn Kelly asked Lieberman to respond the gathering criticism of Hagee's remarks. But instead of distancing himself from Hagee's views as McCain had, Lieberman launched into a spirited defense of the televangelist, describing him as someone who "represents a lot of people in this country, particularly Christians who care about the state of Israel."

At the time, prior to McCain's sweeping renunciation, Lieberman could have reasonably claimed to be unaware of the preacher's repugnant views on the Holocaust. Now, he has no excuse for ignorance. As a key McCain surrogate who McCain may select as his running mate, Lieberman must know why Hagee is no longer welcome on the so-called Straight Talk Express.

So why the silence? Why won't Lieberman, who is married to the daughter of Holocaust survivors, end his relationship with Hagee as well? Why, in apparent defiance of the McCain campaign, does he remain scheduled to headline Hagee's upcoming summit? If Lieberman plans to continue touting his moral fiber and independence as his greatest assets, he must renounce the hate-mongering Hagee.

The new progressive pro-Israel lobbying organization J Street released a petition today calling for Lieberman to terminate his relationship with Hagee. You can add your name by clicking here. With your help, Lieberman may finally conclude that Hagee is really a mamzer, not a man of God.