Mary, I think you've definitely got a future as a political consultant for dead presidents.
On a more serious note, what you've suggested would be a great project to give students - Use primary and secondary source documents to research a dead president's strengths and weaknesses, then devise a plan to use them to maximum effect in a modern political campaign.
It seems mostly forgotten now, probably due to his association with the Vietnam war, that Johnson could also be a terribly eloquent speaker. Perhaps his finest address as president was his 1965 speech before Congress urging passage of the Voting Rights Act. It is available from the American Rhetoric site.
It builds and builds, so all who choose to listen, please do so all the way through.