The mailman was in for a surprise when he learned the real reason for the boy's tears.
A spirit of cooperation is tested ahead of a crucial series of meetings to prepare for a Nov. 15 US summit.
Both candidates would likely draw from previous administrations to build their teams.
If Obama wins and Democrats gain greater control in Congress, it could happen.
Republicans hope to head off a filibuster-proof Senate controlled by Democrats.
Obama seems to be benefiting so far, but McCain forces are hustling to get their supporters out, too.