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If you thought Obama was running as a progressive and would govern as a liberal and/or progressive, well you simply weren't paying any attention and got fooled by his rhetoric.
As a centrist Democratc I knew the only difference between him and Hillary was experience, but as far as their centrism, Obama is far more conservative.
So far I like what Obama is doing because he isn't playing ideological politics. He is being smart and pragmatic and wants solutions. If you want ideology you should have voted for Nader.