I've been reading Marx again lately. I think he is worth going back to... Marx before Marxism, as it were. I've suggest the following:
1) Philosophically, what Marx tried to do was come up with a way of understanding the movements of society and history in a deep sense... his ultimate "object" is the whole of human history. Marx thought: Humanity has a common purpose... Or, rather: It is possible to consider humanity from the perspective of a common purpose, which is a kind of ideal to be striven for. Marx actually says (in the 1844 Manuscripts) that "communism is the real movement..." of this striving... and he emphasizes that it is not itself an ideal, not a state of affairs. Interesting, that. Communism in some sense is silent, is nothing... "the silent weaving of the spirit." Maybe.
2) Politically, Marx thought that he could identify a certain key group of people who could, would, did, must, instrument historical progress. Progress towards the common purpose. The proletariat. He has a complex hydra-headed argument for why the proletariat = the forces of progress. The interesting question is: "Who is the proletariat?" Marx's analysis produced the following conclusion: industrial factory workers. But, given the slippery nature of his Hegelian lube, it seems things need to be a little more abstract then that... And in the end, it wasn't simply "the workers" who revolutionized Russia, but also Lenin, the party, the first World War... a complex conjuncture... Few Understand. But these things are not easy to understand.