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Quayle said Romney is the only Republican who meets his four criteria for determining who he will support in a presidential race — leadership, character, conservative philosophy, and electability.

"He has proven over and over again that he is a leader," Quayle wrote. "He has demonstrated he is capable of making tough decisions and turning things around. He is a man of integrity. He understands budgets and financial markets. He balanced budgets and met a bottom line. He is strong on national defense and has a deep love of the principles that make America great."

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