This estimation was made in Cuba in the presence of several members of The Weathermen terrorist group to which William Ayers (friend of Obama) belonged to:
Grathwohl: I brought up the subject of what's going to happen after we take over the government. You know, we become responsible for administrating, you know, 250 million people. And there was no answer. No one had given any thought to economics. How are you going to clothe and feed these people? The only thing that I could get was that they expected that the Cubans, the North Vietnamese, the Chinese and the Russians would all want to occupy different portions of the United States. They also believed that their immediate responsibility would be to protect against what they called the counter-revolution. And they felt that this counter-revolution could best be guarded against by creating and establishing re-education in the Southwest where we would take all of the people who needed to be re‑educated into the new way of thinking and teach them how things were going to be. I asked, "Well, what is going to happen to those people that we can't re‑educate, that are die-hard capitalists?" And the reply was that they'd have to be eliminated and when I pursued this further, they estimated that they'd have to eliminate 25 million people in these re‑education centers. And when I say eliminate, I mean kill 25 million people. I want you to imagine sitting in a room with 25 people, most of whom have graduate degrees from Columbia and other well-known educational centers and hear them figuring out the logistics for the elimination of 25 million people and they were dead serious.
Source: Dr. Sanity
Hat Tip: Purple Slog (who has an interesting question regarding the 5GW aspects of Obama's Campaign)
You need to remember this when you hear someone say that they want "social justice" because that is just code for communism and the wholesale slaughter of those who disagree once they establish their order.
You need to remember stuff like this when you some doped out teenager or aging hippy wearing a shirt with Che's mass-murdering face on it. Not all the people on the left are supporters of mass murders...but they are useful idiots who will vote in people who are more than happy to establish the above mentioned pogrom.