Much like George Bush, Feith simply exemplifies the Peter Principle.

Never having read the book (it sounds like a dubious honor or distinction that we'd be after, if we desired to have satisfied in us what I take to be the book's premise), I am able to say of the principle (and of Dahlia's relationship to it) only that Dahlia would demonstrate it from the bottom up. Bolstering or balancing or supporting Feith, if you will.