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Thinking politically -- i.e. thinking from the perspective of being one among say 20 or40 (or 2 or 4) in a room trying to determine what their next action should be, and how it should be framed -- comes hard.
We are not in a biology or anthropology seminar here. Yes, we know tht "race" has no biological basis, and that in many ways the ultimate premise of racism is that race exists. In this 'purely' academic sense, in the sense of conversation carried on in abstraction from social struggle, "We are all one race' might be taken as a way of noting that "race" does not name anything.
But as soon as you enter the realm of social actuality and social struggle, that proposition is, to put it technically, a fucking lie. Yesterday at the Chicago anti-war rally (an march and rally organizied as a specific attack on Obama), one of the speakers was from the Black Agenda (Glen Ford's group). Much of his speech was on expected targets, and then (this is where I started to listen) he noted that South Chicago was not represented in the rally, nor were (a couple other Black neighborhoods). Blacks he said (as Glen Ford had emphasized at the Left Forum, had built a wall around the Black Brother to protect him from criticism. The speaker developed this at speaker developed this in some detail. Then the last part of the speech noted who and what were "inside" that wall and who and what were "outside" it. And he simply could not have made that speech under the banner of "We are all One Race." (Think politically when you define "race" for political purposes.) We are not _one_, and it is going to be one long terrible struggle, within "the left" as in the nation as a whole, before that concept is anything but a lie, a hiding of reality under a liberal rug.
When we can say that we will probably already, the state smashed, trying to build socialism.
Carrol