(POLITICO) Barack Obama’s top advisers are making a mid-“core” correction in their attacks on Mitt Romney — with a little nudge from Bill Clinton, who is finding a niche as an Obama campaign whisperer and fundraiser.

Late last year, as Romney galloped to the right, Obama’s messaging team hit on what it assumed would be a durable bumper-sticker attack: Romney, senior advisers David Plouffe and David Axelrod intoned time and again, was a political shape-shifter who lacked any real moral or political “core.”

The slogan was the Obama talking point for months. But Clinton, echoing survey data presented by Obama’s own pollster Joel Benenson, quietly argued that the empty-core approach failed to capitalize on what they see as Romney’s greatest vulnerability: An embrace of a brand of tea party conservatism that turns off Hispanics, women and moderate independents.

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