A longtime colleague of John McCain’s has endorsed Mitt Romney:

“The thought of his being president sends a cold chill down my spine,” Cochran said about McCain by phone. “He is erratic. He is hotheaded. He loses his temper and he worries me.”

McCain’s run-ins with other Republican senators are legendary…

I’m more concerned about McCain’s liberalism, frankly, than his temper. As the Captain notes, he does not evoke confidence regarding potential Supreme Court nominations – and if he ain’t good for that he ain’t good for much.