Like rhyme

Like rhyme, repetition can make a sentence or phrase “catchy,” or more memorable, creating a rhythm for the words which can stick with the listener as much or more than the actual words spoken do. Often this repetition will extend beyond just a single thought, and a word or phrase will be repeated several times throughout the entire address.
Repetition is one of the most frequently used devices in political speeches both in English and American. Repetition is the use of same words repeatedly in a speech to make clear by special emphasis to a point. Repetition is classified according to compositional patterns. If the repeated word (or phrase) comes at the beginning of two or more consecutive sentences, clauses or phrases, this type of repetition is called anaphora. The research we have carried out shows that anaphora is one of the most frequently used types of repetition both in the speeches of British and American politicians.