While you all are debating the reaction if another candidate had fainted or come down with pneumonia at age 68, it's probably worth noting that virtually any other candidate except Obama could have gotten away with simply not attending due to illness IMO. Take a pass, claim a bad flu bug, find some other way to show you care about the victims of 9/11 and national security a couple days later, and that's that. Only Clinton and Obama would get killed for bailing because of the various types of mud slung at them.