Since the 1917 revolution, the spectre of "International Communism" has haunted American Politics like the phantom blood and daggers in Lady Macbeth's mind. Br@ndon's post, Democrats Support the Communist Manifesto, provides a perfect example of the endurance of this particular phenomena - drawing upon a shallow and uninformed understanding of Marx's political and economic writings and referencing that inadequate information against a similarly glossed over assessment of Progressive American Politics.
To put this myth to rest once and for all - we need to first understand Marx's central ideas. To really get a handle on Marx, a diligent reader would have to digest Das Kapital, and then move on to the Communist Manifesto - which amounts to a multi-week undertaking of epic proportions. Not to disparage my fellow Newsvine users, but few of us have either the time or the inclination to delve so deeply into the Frankfurt school.
Thus - perhaps a concise summary of Marx will stand in the place of this Herculean read. Marx's philosophical ideas run along two parallel tracks.
1 - Class struggle (the conflict between the rich and the poor) is the motivating force in all of history
2 - Eventually society will naturally progress to a point where all artificial means of wealth will pale in comparison to the ability of a person to do work.
When reactionaries point to some of Marx's forcasted landmarks (like the nationalization of property or the centralization of economic power) and shout "Communism!" they only serve to show themselves as fear mongers. Marx's predictions are not the battles to be won by Communist Revolutionaries, but merely the economic and political sign posts that his theory of history yields.
In short - that American Progressives have fought for some of Marx's political landmarks does not in any way mean that they "support" The Communist Manifesto, but that they support the institutions and developments that Marx's political theory suggests will occur in a society being inexorably pushed towards a more equitable future.