Mitch, I recommend to you Jonah Goldberg's "Liberal Fascism", for its discussion of the phenomenon of fascism and its manifestations in various countries. One point that he makes is that where fascist ideas took root, they produced slightly different variations, depending on local conditions. It's a new model for looking at the movement and placing it among other political philosophies that have emerged from the Western philosophical tree. The various forms of Marxism and its descendants actually agree on enough questions that it's more accurate to say that they represent related animals, in much the same way that the cats are all related to one another, that they share the same basic design.
I'll concede the details on Mussolini's break with the party, I have to go back and re-read his history, though it still shows that his break was because of an abandonment of the internationalist ideal, in my opinion. He was on the path to the ideal of a national state that enclosed all aspects of society. Granted, he may not have achieved the same level of totalitarianism that the Nazis did in Germany, or the Communists in the Soviet Union, China, and their satellites, but that may lie with the character of the various branches of the Italian people that were gathered into the national state in the Risorgimento. I agree with you, his power was based much more on the consent of the people, not in our English Enlightenment sense, that there were free elections, but that they didn't rise up and remove him, until he had made his bad choices and led the country into a disaster.
Congratulations, too, on a great topic for discussion! It's a good counterfactual to think about what might have happened if Mussolini hadn't actively participated in the war. Could he have lasted, as Franco did, in a neutrality benevolent to Germany and serve as a counter-weight to the Allies?
Prost!
Brad