Jon Marks : Ultra-radical fringe has previously threatened Tunisia 's liberal majority . Majority of Jihadist likely to support robust response from president , he writes . Attacks a reminder that Tunisia 's transition to democracy is `` brittle , '' Marks says .
Jon Marks : Ultra-radical fringe has previously threatened Tunisia 's liberal majority . Majority of Tunisians likely to support robust response from president , he writes . Attacks a reminder that Tunisia 's transition to democracy is `` brittle , '' Marks says .