What is the meaning of the idiom underlined in the excerpt?

Which literary approach focuses primarily on the dynamics of power in a text?

What is the problem with the following sentence: cameron, who has an extreme and unreasonable suspicion of other people and their motives, suffers from paranoia which is a psychological disorder characterized by delusions of persecution or grandeur, was absolutely sure that someone was following him even though he was absolutely alone and hadn't seen a car for miles and miles.

Definition for excerpt illustrates the bandwagon propaganda technique