CHARLOTTE, N.C.--Democratic Senator John Kerry denounced Mitt Romney's approach to world affairs on Thursday and praised President Barack Obama's handling of national security, telling any doubters to "ask Osama Bin Laden if he's better off now than he was four years ago!" The decorated veteran and foreign policy expert also accused Romney of getting his information about Russia from "Rocky IV." "Here's the choice in 2012: Mitt Romney--out of touch at home, out of his depth abroad, and out of the mainstream?" Kerry said in a red-meat speech on the final night of the Democratic National Convention. "Or, Barack Obama—a...