I apologize for the cut and paste, but I specifically went looking for this information:
Obama asserted that the Constitution is a charter of negative liberties in that it states what the State and Federal government could not do to you. He asserts that it is flawed in that it does not state what the State and Federal governments should be obligated to do on your behalf. In discussing the Warren court, Obama stated that it wasn't truly radical in that it did not break free from the constraints placed upon it by the founders. He noted that the court never ventured into the issue of redistribution of wealth, and sort of more basic issues of political and economic justice in the society.