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Obama knows what he says is going to be parsed like crazy, so I wonder what the motivation for this was. Certainly he can't think he can intimidate justices into voting his way, so maybe he's setting the groundwork for the campaign.
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You are correct, Obama is setting the stage to claim that the Supreme Court striking down his health care law was judicial activism by the conservative members of the court. He will assert that the Court is doing the bidding of the corporations and the wealthy, and his dumbed down base will believe it.