Or she could say she's in awe of his ability to promote himself, or to get the media to talk about him, or to energize his base, or to hold large campaign events, or to perform at a high level in multiple careers, or to bed women, or to accumulate wealth...
His drive is based on his ego, so I don't know why his staying power would surprise you.
Donald, you really know how to promote
yourself.
Donald, you really know hot to get the media to talk about
you.
Donald, you really know how to energize your base...with hate speech.
Donald, you really know hot to hold large campaign events...in which you have people beaten regularly.
Donald, you really know how to bed women.
Donald, you really know how to accumulate wealth...by declaring bankruptcy.
Maybe something about his ability to build a brand or work hard would work. I personally would have a difficult time keeping a straight face on these as well because something would pop into my mind having to do with these.
You really know how to build a brand...by being a douchebag.
You work very hard, because you are defined by your ego and therefore have to put your name on everything, including your child.
Point is, I am not Clinton or an actor, and these would be hard for me.