Recently, red lines both figurative and -- since Israeli Prime Minister Benjamin Netanyahu's prop-assisted speech to the United Nations two weeks ago -- literal have come to dominate the Iran policy discussion. While Netanyahu was as explicit as possible in his delineation of Israel's red line regarding Iran's nuclear status, President Obama has been reluctant to draw one. Instead, he has offered different, even contradictory, messages to two audiences: To Israel, he has pleaded for patience; to Iran and reluctant U.S. allies, he has warned that "time is not unlimited."

Problem is, neither audience seems to believe him. To address this, he should communicate clearer limits on American forbearance by setting his own red lines for Iran...

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