From the moment he took office as governor in 1928 to the day an assassin's bullet cut him down in 1935, Huey Long wielded all but dictatorial control over the state of Louisiana. A man of shameless ambition and ruthless vindictiveness, Long orchestrated elections, hired and fired thousands at will, and deployed the state militia as his personal police force. And yet, paradoxically, as governor and later as senator, Long did more good for the state's poor and uneducated than any politician before or since. Outrageous demagogue or charismatic visionary? In this powerful new biography, Richard...