(CNN) - Mitt Romney's former rival Newt Gingrich issued a harsh assessment of the GOP nominee's campaign strategy Wednesday, saying Romney's presidential bid was struggling in key battlegrounds against President Barack Obama because of a messaging failure.
"The Romney campaign has yet to find a thematic way of explaining itself and laying out in a clear, crisp way the difference between Romney and Obama. And I think that frankly is a problem," Gingrich said on CNN's "The Situation Room."
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The former House speaker's remarks came after a question about why polls show Romney struggling in key electoral battlegrounds like Florida and Ohio. The latest CNN Poll of Polls in Florida shows Romney trailing Obama, 50%-45%, while in Ohio the president is up by seven, 51%-44%.
Gingrich also attributed the president's lead in some states to a massive spending push on the part of the Obama campaign, which he said allowed Democrats to define Romney at an early stage in the campaign.
Not embracing the records of Republican governors like John Kasich in Ohio and Rick Scott in Florida is also a mistake, Gingrich said, since those states have economies that appear to be rebounding. In publically hailing the two states' economies, however, Romney runs the risk of appearing to praise Obama for his own policies, like bailing out to auto industry, that have played a part in stemming job losses in each state.
The conundrum, Gingrich said, was not being met with the proper flexibility by Romney's campaign.
"The campaign doesn't seem to be able to pivot and say, you know, John Kasich's doing the right stuff here in Ohio and I want to take John Kasich's model to Washington because Kasich is for a smaller government, less regulation, more American energy, pro-jobs."
"They seem to have this overly methodical model where they go out and keep saying the same thing, and the world's too fluid," Gingrich said. "The world's too sophisticated for that."
"There's plenty of ammunition," he concluded, adding he thought "a campaign which made that case clearly enough would carry Ohio and Florida by big margins."
Gingrich, who at one point was Romney's top rival for the GOP presidential nomination, also took issue with the latest ad from Romney's campaign, in which the candidate looks directly into the camera to deliver an assessment of the economy.
In the ad, Romney acknowledges that "President Obama and I both care about poor and middle-class families," but goes on to suggest the president's policies have made it harder for Americans to find work and rely less on the federal government for assistance.
Gingrich said he was "frankly startled" by Romney's acknowledgment of Obama's compassion for the middle class.
"I don't know why he's saying that," he said. If President Obama cared about the middle class, why did the price of gasoline go to an all-time high?"