A demagogue is a tyrant who owes his initial rise to the democratic support of the masses. Huey Long, Hugo Chavez, and Moqtada al-Sadr are all clear examples of this dangerous byproduct of democracy. Demagogue takes a long view of the fight to defend democracy from within, from the brutal general Cleon in ancient Athens, the demagogues who plagued the bloody French Revolution, George W. Bush's naive democratic experiment in Iraq, and beyond. This compelling narrative weaves stories about some of history's most fascinating figures, including Adolf Hitler, Senator Joe McCarthy, and...