The Israel variation of Godwin's Law

We need a new variation of Godwin's Law. The original reads:

As an online discussion grows longer, the probability of a comparison involving Nazis or Hitler approaches one.

The new variation could read:

As a political discussion about Israel grows longer, the probability that a defender of Israel will level accusations of anti-semitism against the critics of Israel approaches one.

The same holds true for any discussion about a Jewish politician.

(Post inspired by this from Steve Gilliard).

And we need a new rule: any accusation of anti-semitism must be backed up by specific examples of said anti-semitism.