It used to simply be the revolving door back to executive industry positions, which is what ALL the FCC and their ilk are headed by. Those exec positions used to function as the main "deferred bribery" mechanism, because who can question someone getting another job once the administration job ended? You mentioned the Obama administration, I remember the massive criticism early in his admin with the number of revolving door appointees to the various industry-focuses administration positions. The pay cuts they had to take for "public service", and the "oh look at their sacrifice to their country". OH PLEASE. PLEASE.
Now since citizens united, it's my impression that the lobbying industry / K street is now completely awash in money even moreso and that is the main source of "deferred bribery". I think near the end of the Obama admin there was going to be a rule change about joining a lobbying firm when you were done with congress. Holy crap did a lot of congress quit all of a sudden. They were cashing in.
Rudy Giuliani made a million bucks a year from his law firm. Why? He's not a good lawyer.
There is also cush jobs for family members and numerous other ways to do such things. Biden's son is an example, I've seen really crummy stories around Clarence Thomas's family a decade ago that made me realize the Supreme Court was far from an ivory tower immune to corporate influence.
Let me ask you a question: why does EVERY SINGLE, D or R, president take a trip to Saudi Arabia near the end of their presidencies? They are the effing president of the USA and they travel TO Saudi Arabia to basically kiss the royal family's butt?
Washington is AWASH in money. Yet nobody significant, the central focus of the all that lobbying money, goes to jail.
This is hilariously like NCAA football, but with less scrutiny, far more money. Everyone knows its going on, nobody talks about it, sometimes someone gets busted for going "too far".