Muckety is a website that maps out the relationships that exist among people in national politics. Its a great way to get used to the connections that allow poeple to get where they get.
Click here for the map surrounding Chuck Hagel and John Brennan.
While were; at it here's Jacob Lew and John Kerry.
My advice to you if you want to rise the ladder in whatever you do? Get connected. It aint what you know, its who you know. But you knew that.