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Former Pennsylvania Sen. Rick Santorum isrunning his presidential campaign on "ego and emotion,"a backer of rival Mitt Romney said on Monday. Former New Hampshire Gov. John Sununu referred to a weekend incident, in which Santorum engaged in a heated exchange with a New York Times reporter.

"Sen. Santorum really has lost his personal discipline and self-control in the process, lashing out at the press and frankly lashing out at his opponents," Sununu told reporters on a conference call.

[Seephotos of the 2012 GOP candidates.]

After a campaign event in Wisconsin on Sunday, Santorum was repeatedly asked to clarify a portion of his speech, but the candidate got agitated with the questioning.

"Quit distorting our words. If I see it, it's bullshit. Come on man. What are you doing?" Santorum said. "I'm upset when the media distort what I say. Yeah I do get upset. You know exactly what I was saying and you're misrepresenting it. What are you guys in the business of doing, reporting the truth or are you here to try to spin and make news? Stop it."

Romney's campaign jumped on the outburst.

"It is one thing to lose your temper at a New York Times reporter and it's another to have to deal with the pressures of folks on the international stage and even opposing congressional leaders," said Sununu, who served as chief of staff for President George H.W. Bush.

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"You need discipline, you need self-control, you need to be able to handle your messaging and focus on it. You need to have a temperament that makes people want to follow the leader as president and certainly Rick Santorum's outburst in the last few days has in my opinion disqualified him completely," he added.

Also on the call was former Wisconsin State Sen. Ted Kanavas who touted Romney's support for the Badger State's embattled GOP Gov. Scott Walker.

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Romney Backer Says Santorum Has Lost 'Discipline and Self-Control'