I think he has to calibrate it very carefully. The White House says it is going to be a very optimistic speech. But I think people are not feeling very optimistic at the moment.
Leadership is about calling people to do things beyond themselves.
A leader's role is to raise people's aspirations for what they can become and to release their energies so they will try to get there.
I'm told by some people close to him that this will not be a Kerry-bashing speech. But he's not going to simply rally around Bush. Indeed it's going to be the story of an immigrant coming to this country and finding a country that's embraced him and a party that's embraced him.
If people stay that long, group-think can set in, and that's dangerous for a president.