After arguing over Iraq, John McCain and Barack Obama moved quickly to probably the next most emotional argument in foreign policy—Israel.

They got into it over a question from moderator Jim Lehrer over Iran, and McCain went for the most crucial line: “We cannot tolerate another holocaust.”

That hits a weakness for Obama, whose enthusiasm for Israel is questioned by some in the U.S. Jewish community.

Then McCain went for another claim that’s been debunked: That Obama refused to call the Iranian Revolutionary Guard a “terrorist” organization.

Obama had sponsored legislation that did just that, but voted against a bill including that measure which, he said, also included authorizing an open-ended effort in Iraq.

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