The Washington Post reports that John McCain’s outbursts of temper and abusive language have alienated a lot of Republican colleagues. Some Republicans who’ve experienced these incidents think McCain is unfit to be president.

John McCain once testified under oath that a Senate colleague inappropriately used tobacco corporation donations to sway votes on legislation. He cursed out another colleague in front of 20 senators and staff members, questioning the senator’s grip on immigration legislation. And, on the Senate floor, McCain (R-Ariz.) accused another colleague of “egregious behavior” for helping a defense contractor in a move he said resembled “corporate scandals.”

And those were just the Republicans.

In a chamber once known for cordiality if not outright gentility, McCain has battled his fellow senators for more than two decades in a fashion that has been forceful and sometimes personal. Now, with the conservative maverick on the brink of securing his party’s presidential nomination, McCain’s Republican colleagues are grappling with the idea of him at the top of their ticket. …

(Some) have outright rejected the idea of a McCain nomination and presidency, warning that his tirades suggest a temperament unfit for the Oval Office.

“The thought of his being president sends a cold chill down my spine,” Sen. Thad Cochran (R-Miss.), also a senior member of the Appropriations panel, told the Boston Globe recently. “He is erratic. He is hotheaded. He loses his temper and he worries me.”

A former colleague says McCain’s abrasive nature would, at minimum, make his relations with Republicans on Capitol Hill uneasy if he were to become president. McCain could find himself the victim of Republicans who will not go the extra mile for him on legislative issues because of past grievances.

“John was very rough in the sandbox,” said former senator Rick Santorum (R-Pa.), who is outspoken in his opposition to McCain’s candidacy. “Everybody has a McCain story. If you work in the Senate for a while, you have a McCain story. . . . He hasn’t built up a lot of goodwill.”

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The Romney Campaign has compiled a list of ten McCain temper incidents.

Examples:

Defending His Amnesty Bill, Sen. McCain Lost His Temper And “Screamed, ‘F*ck You!’ At Texas Sen. John Cornyn” (R-TX).

Sen. McCain Repeatedly Called Sen. Pete Domenici (R-NM) An “A**hole”, Causing A Fellow GOP Senator To Say, “I Didn’t Want This Guy Anywhere Near A Trigger.”

Sen. McCain Had A Heated Exchange With Sen. Charles Grassley (R-IA) And Called Him A “F*cking Jerk.”

In 1995, Sen. McCain Had A “Scuffle” With 92-Year-Old Sen. Strom Thurmond (R-SC) On The Senate Floor.

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Ronald Kessler warns:

People who disagree with him get the f*** you,” said former Rep. John LeBoutillier, a New York Republican who had an encounter with McCain when he was on a POW task force in the House. “I think he is mentally unstable and not fit to be president.”

Andrew H. “Andy” Card Jr., President Bush’s former chief of staff, told me he has observed McCain’s outbursts.

“Sometimes he was pretty angry, but I felt as if he was putting on a show,” Card said. “I don’t know if it was an emotional eruption or it was for effect,” Card said.

Democrat Paul Johnson, the former mayor of Phoenix, saw McCain’s temper up close. “His volatility borders in the area of being unstable,” Johnson has said. “Before I let this guy put his finger on the button, I would have to give considerable pause.”

When I appeared on Tucker Carlson’s MSNBC show to discuss Newsmax’s disclosures about McCain’s temper, Carlson said on the air, “We got a call earlier tonight from McCain’s Senate office suggesting that we not do this story. [They were] annoyed about it.”

That hint at intimidation is another reason why major media outlets may think twice about revealing what they know of McCain’s temper, which is widely whispered about in Washington. Yet along with track record, such clues to character are a compass to how a president will conduct his presidency.

Over and over, voters have ignored warning signs of poor character and have overlooked track records, only to regret it once a president enters the White House and becomes corrupted by the power of the office.

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Arizona News: McCain’s Unstable Temper Raises More Doubt.

His temper has been an issue for years.

In the 2000 presidential bid, McCain was dubbed “Senator Hothead” by Newsweek. That year, he won endorsement from only a few Senate colleagues. His frequent attacks and volatile personality were most likely to blame. “McCain notes,” which offer apologies after heated words, are held by many members of Congress. …