Romney Sharpens Attacks, Tests Gingrich Pledge to Stay Positive
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After Newt Gingrich renewed his call to run a "positive campaign," Mitt Romney is putting that pledge to the test -- unleashing a new ad that questions Gingrich's past cooperation with House Democratic Leader Nancy Pelosi on climate change and knocking his understanding of the economy.
The new round of criticism from the former Massachusetts governor comes ahead of a Fox News debate Thursday where the Republican frontrunner is sure to face criticism from all sides, on a record and leadership style that spans decades and is increasingly coming under the microscope.
