The GOP presidential candidates love to warn voters of the threat of Islamic terrorists. Not a day goes by without Sen. Ted Cruz (R-Texas) bemoaning the threat of "radical Islamic terrorism." Gov. Scott Walker (R-Wis.), while complaining that President Barack Obama does not frame the fight against terrorism as a fight against Islam, recently conceded that not every Muslim is a terrorist and that there are "handful of reasonable, moderate followers of Islam." But amid all of the fear-mongering about terrorists, it might be wise for presidential candidates to be able to identify the names of actual terrorists, like the head of the Islamic State, Abu Bakr al Baghdadi, and the head of al Qaeda, Ayman al Zawahiri.