I believe in the "deep state".
There's a poll out which shows support for a theory of the "deep state" is surprisingly high, surprising to some that is.
Personally I think it's common sense, though I define "deep state" a little differently. In my view there are a relatively small number (i.e. less than 1 percent of Americans) who routinely affect the way government operates in ways which aren't visible to Americans on a daily basis. This would include all the riders and special provisions tucked into laws, particularly appropriations acts and omnibus or "must pass" legislation. It would include all the lobbyists, pollsters, and members of the "chattering class", as William Safire used to call them. And of course it includes the bureaucrats and lawyers who are concerned with process and procedure, much to the dismay of some politicians.
In most cases the deep state is operating within the overall context set by the limits of public support. An example on the liberal side--I could argue the "deep state" essentially legalized gay marriage.