The national deficit is rising to "unsustainable, ruinous heights," Shawn Tully writes in a Fortune commentary. Tully notes that liberal economist Paul Krugman and staunchly conservative Rep. Paul Ryan, R-Wis., are raising alarms about the deficit. "When the two combatants agree on a fundamental threat to the U.S. economy, Americans should heed this alarm as the real thing," Tully said.

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