One of my all time favorite books (although it got mixed reviews when it was released, and was not considered a success) is Mario Puzo's "The Fourth K". Political thriller surrounding the election of Francis Xavier Kennedy, the FOURTH Kennedy, as it were, to enter politics.
I recommend it highly. I've read it about 5 times, and have it both on physical and digital (bought it from Amazon).

info from Wiki:
President Francis Xavier Kennedy is elected to office, in large part, thanks to the legacy of his forebears–good looks, privilege, wealth–and is the very embodiment of youthful optimism. Too soon, however, he is beaten down by the political process and, disabused of his ideals, becomes a leader totally unlike what he has been before.
When his daughter becomes a pawn in a brutal terrorist plot, Kennedy, who has obsessively kept alive the memory of his uncles’ assassinations, activates all his power to retaliate in a series of violent measures. As the explosive events unfold, the world and those closest to him look on with both awe and horror. The novel's emphasis is on the characters. The reader learns about a character's background when he/she has to make a major decision. Critics have stated that, once the book has focused on a particular character, he/she is relegated to the background and never again returns to prominence.
Mario Puzo has stated: "The Fourth K was a [commercial] failure—but it was my most ambitious book."