A top aide to Barack Obama voiced fears Sunday that Hurricane Sandy could hurt the president's re-election chances by reducing turnout, as the impending storm forced both candidates to cancel campaign stops. Republican challenger Mitt Romney received good news in two key swing states, winning the endorsement in Iowa of the main newspaper, the Des Moines Register, and tying Obama in a newly-released poll in all-important Ohio. But nine days out from the nailbiter November 6 election, all eyes were on Hurricane Sandy and how the potentially catastrophic storm might play out on the neck-and-neck race for the White House....