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President Obama is empowering radical Islam across the Arab world. He is presiding over both the American decline and the rapid advance of our mortal jihadist enemies. From the Middle East to North Africa, the Arab Spring has turned into an Islamist winter. Contrary to the administration’s claims, the popular uprisings have not led to a “rebirth of freedom” - the emergence of liberal democracies in distant Arab lands. Rather, Muslim fundamentalists have used street protests against corrupt, autocratic regimes as a Trojan horse to expand Islamic militancy.

In Tunisia, an Islamist party with ideological ties to Egypt's Muslim Brotherhood is poised to win national elections. Its goal is to repeal the nation’s secular traditions (inherited from the French...