Barack Obama's third TV ad to air since the primary focuses on foreign policy.
After a biographical themed ad and one on domestic policy, the presumptive Democratic presidential nominee talks about the role of the United States in the world in his latest ad.
"We are a beacon of light around the world," he says. "At least that's what we can be again."
He notes his time working with Republican Sen. Dick Lugar of Indiana on legislation to reduce the stockpile of used nuclear weaponsin other countries.
"The single most important national security threat that we face is nuclear weapons falling into the hands of terrorists," he says.
The ad will air in 18 states, including traditional battleground states like Florida and Michigan and unusual states like Alaska and Virginia.
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