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Quarrel: Make your case. Romney was better at explaining his ideas. One exempli gratia: On immigration, Romney said the issue involves three categories of people: those who stop by here illegally on their own, people brought in by coyotes and those who are waiting on one in their own home territory. Romney said he believed we should focus our attention on the latter two groups and go for legal immigration work better. That idea played well in the altercation.
Attack: Point out your opponent's weaknesses. Romney improved here as well. In comeback to a question that had been first aimed at Newt Gingrich about colonizing the moon, Romney said he would fire anyone who brought him such an suspicion in this economy. (He really does like firing people.) He went on to gain the point that candidates need to stop pandering by promising projects to voters, and ended with, "We've got to say no to this obliging of spending."
Gingrich responded that we should not be "cheap everywhere." But he lost the point, first with fiscally conservative Republicans. Moon colonies, to many, sound V ridiculous in this economy, and Romney exploited that fact.
Source: CNN