Presidents and their administrations come and go, but the bureaucracy is always there, doing the real work of the government.
The bureaucracy runs the government no matter who's in office.
Change the bureaucracy, you'll literally change the world...
However, to change the bureaucracy, you'll have to cut their budgets and fire thousands in each department. Since that isn't going to happen, real, significant change isn't going to happen.
And since the bureaucracy hasn't changed much since the 1930s (except growing much larger and sticking its tentacles into the far reaches of our lives), it's proof that running for US President is just an ego-trip.
So go vote for the airbag that talks the best, says all the right things, and successfully hid/explained the skeletons his his closet.
But remember, he's in it for the "supposed" power, prestige, and perks. He's not in it to upset the status quo, shake up the world, fix the broken things, or just plain "do the right thing".