NEW : Barack Obama , John McCain , roses at ground zero . New polls show both candidates with slim leads in key battleground states . Biden speaks with first responders in Parma , Ohio . Sarah Palin back in Alaska for son 's deployment ##s .
NEW : Barack Obama , John McCain lay roses at ground zero . New polls show both candidates with slim leads in key battleground states . Biden speaks with first responders in Parma , Ohio . Sarah Palin back in Alaska for son 's deployment ceremony .