Not saying she's actually good, but she's exceptionally good for a lib and would be an easy shoe in to replace Biden.

To that note, all they'd have to do is pick him up while he's sleeping and put him in an office building with the most basic mock-up of the White House and he'd never notice. He won't remember the shape of the oval office, just plaster up some generic out doors pictures for "windows", get some college theater kids to play staffers and joint chiefs. If he comments that something is off, just tell him there's some remodeling going on. Gradually transition him to the memory ward and just tell the nurses to tell him that they're his new aides and that he's solved whatever issue he asks about.