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You say: "I truly believe that Obama wants to be pushed leftward, but wants to begin from a position of consensus, adopting the most "progressive" he can without courting controversy."
I'm reading a biography of Nixon by Anthony Summers ("The Arrogance of Power") in which a high ranking Democrat (can't find the quote at the moment) is quoted as saying (basically) that any candidate who defines him/herself vaguely enough so as to encourage voters to complete the sentence, is doing the electorate a tremendous disservice. This is, after all, how we got the "New Nixon" in 1969 - and we all know how that turned out. This is an aspect of Obama that is making many voters very nervous.