President Obama has paid tribute to US envoy Chris Stevens "as everything America could want in an ambassador" as his body and three of his Benghazi embassy staff were returned to US soil.
He said Mr Smith, Glen Doherty, Tyrone Woods and Sean Smith were "four patriots who loved their country, chose to serve it and served it well. They knew the danger and they accepted it."
"They lived and embodied the American ideal," he said.
President Obama vowed to do everything possible to protect Americans overseas as he honoured the four killed in the Libyan consulate attack.
Both Barack Obama and Mitt Romney know how they respond to the spread of violence across the Arab world could affect their election hopes.
Mitt Romney has attempted to score cheap, tawdry political points in the wake of the worst attack on the US diplomatic service in decades.