The first Republican presidential primary may be more than two months away, but some Democrats are convinced that former Massachusetts Gov. Mitt Romney will be the eventual GOP nominee – and they already are rolling out their general election attack strategy.

Speaking on NBC’s “Meet the Press” on Sunday morning, White House senior adviser David Plouffe said Mr. Romney “has no core,” an assault on the Republican front-runner’s track record of changing positions on issues. Many conservatives also remain skeptical of Mr. Romney, who is seen as especially vulnerable to charges of flip-flopping but remains at or near the top in most polls.

Businessman Herman Cain is now Mr. Romney’s biggest threat and has overtaken him in Iowa, polls show.

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