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For the last few months, conservative critics of the Obama administration’s foreign policy have obsessed about its failure in Libya. The fiasco in Benghazi that took the lives of four Americans including our ambassador deserved more media scrutiny and Republicans are right to continue to demand answers about it. But the unfolding disaster next door in Egypt is a far greater indication of the way the president has blundered abroad than even that tragic episode. Obama’s decision to force the Egyptian military to accept a Muslim Brotherhood government in Cairo and Washington’s subsequent embrace of Mohamed Morsi’s regime has materially aided the descent of the most populous Arab country into the grip of an Islamist party. The Brotherhood regime is determined to...