CHARLOTTE, N.C. — His re-election in doubt, President Barack Obama conceded only halting progress Thursday night toward fixing the nation's stubborn economic woes but vowed in a Democratic National Convention finale, "Our problems can be solved, our challenges can be met."

CHARLOTTE, N.C. — His re-election in doubt, President Barack Obama conceded only halting progress Thursday night toward fixing the nation's stubborn economic woes but vowed in a Democratic National Convention finale, "Our problems can be solved, our challenges can be met."

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