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The possibility that a more liberal voice might have a better idea what Americans actually want is very threatening to this power base - the "centrist" alliance between Republicans, money, and DLC doormats.
A 2004 Harris Poll indicates that 18% of Americans identify themselves as Liberals.
Since you suggest that Liberals may be more in tune with what Americans want, I assume you mean most Americans, not just 18% of Americans. Can you please supply any evidence that supports your "possibility"?