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 Housesenior 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.

On Sunday, however, Mr. Plouffe all but ignored questions about Mr. Cain and instead directed his fire at Mr. Romney, a sign that the Obama administration thinks other Republican candidates ultimately will falter.

Romney campaign spokesman Ryan Williams said the Obama administration’s attacks were signs of desperation and predicted they would fail.

“President Obama can’t run on his abysmal economic record, and he is desperate to distract from the historic loss of middle-class jobs that has occurred on his watch. Americans won’t be fooled by false and negative attacks — they know that President Obama has failed, and they are eager to replace him with a leader like Mitt Romney who can turn around our struggling economy,” Mr. Williams said.

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