Overseas conflicts could upend presidential race for Obama, Romney - The Trail (4:28) 

Attacks against the U.S. in Libya and Egypt serve as a blunt reminder that events overseas could have profound and sudden effects on the U.S. presidential election. Warren Strobel, Reuters U.S. foreign policy and national security editor, looks at four other potential crises that could arise in the final weeks of the campaign, including Iran-Israel, Pakistan and the South China Sea. (September 19, 2012)

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