Since Roman times, virtually every type of government that holds competitive elections has experienced some form of populism -- some attempt by ambitious politicians to mobilize the masses in opposition to an establishment they depict as corrupt or self-serving. From Tiberius Gracchus and the populares of the Roman Senate, to the champions of the popolo in Machiavelli’s sixteenth-century Florence, to the Jacobins in Paris in the late eighteenth century, to the Jacksonian Democrats who stormed nineteenth-century Washington -- all based their attempts at mass mobilization on appeals to the simplicity and goodness of ordinary people. By the mid-twentieth century, populism had become a common feature of democracy.