I think he needs to move fast, but it is not too late yet.
If there was a huge swing in the polls, it means that more voters than expected are still rather fluid in their opinions. He can still swing many of them back before their opinions gel, but he needs to do it quickly - at latest in the first debate.
I do not look forward to 4 more years of bush undermining our great nation with the failed idology of his neo-con advisers (neo-conservatism, like comunism, has some nice sounding ideals but just doesn't work in practice).
In any case, the union survived the corupt administration of Grant - who got re-elected even though history judges him harshly, we can survive bush though I would prefer we not have to suffer such growing pains.
When would it be "to late"? Two days out? lol