The Islamic terrorist attack on the Bardo National Museum in Tunis may have serious ramifications on the fragile moderate center of Tunisian politics. An entente between Islamists and secularists that produced the Arab Spring’s only successful transition to democracy is already shaky. Tunisia has also produced the Arab world’s largest number of jihadis for the Islamic cause in Syria and Iraq, challenging the assumption that democracy is the best antidote for stemming the rise of Islamic extremism.