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A new poll suggests more Americans feel John McCain is better fit on national security.

DENVER, Colorado (CNN) - A new national poll suggests there’s a reason why Wednesday evening’s theme of the Democratic convention is "Securing America's Future.”

Without better marks on foreign policy and national security issues, Barack Obama may have a tough time securing his future in the White House.

A CNN/Opinion Research Corporation poll out Wednesday morning indicates that the American public considers John McCain better than Obama on terrorism and Iraq, and voters consider McCain a stronger leader who would have better judgment in an international crisis.

CNN Election Center: Inside the presidential race

Fifty-eight percent of those questioned think Obama can handle the responsibilities of commander-in-chief, but that pales in comparison to the 78 percent who feel that way about Senator McCain, R-Arizona.

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