In the beginning of Hitchhiker's Guide to the Galaxy, when the narrator is first introducing Zaphod Beeblebrox, he mentions that
"Very very few people realize that the President and the Government have virtually no power at all, and of these few people only six know whence ultimate political power is wielded. Most of the others secretly believe that the decision-making process is handled by a computer. They couldn't be more wrong."
So, does Douglas Adams ever address this later in the series? Are we as readers left to figure out where real power is held,? Does he explicitly address it later in the series?