Pandagon has some ideas about Government in Waiting, picking your cabinet candidates ahead of time.
Some folks claim this is illegal due to promising jobs in exchange for votes, although not for jobs that require Senate confirmation. My way to get around it is simple: list two people for every position. After all, they can’t both get the job, and you have two people double teaming the current crew doing the job. And lord knows there will be places for them in any new administration– do you know how many jobs are going to have to be filled?