I think it means Rove believes both she and Bush are running and he is helping out his next candidate Bush.
As the voiceover narrated---Hillary is seen walking gingerly down the steps of a plane, eyes glued to the steps, hanging on to the railing for dear life---exactly like an old person would do who fears she's not gonna make it down safely.
Now a clip of her waking UP the stairs would have made it even more revealing.