Ritically discuss the techniques employed by 21st-century political speech-writers and speech-makers?

I am MEd/MA TESOL and Applied Linguistics student. I have to write an essay (2000 words) in the subject of Stylistics for the module called Discourse Analysis and Stylistics. The essay question is Critically discuss the techniques employed by 21st-century political speech-writers and speech-makers?

*These are the techniques used by Political speechwriters and which we have studied in the classroom:
1)Imagery (metahpor, simile).
2)Puzzle-Solution.
3)Compare and Contrast.
4)Apt alliteration s artful aid.
5)a. Reiteration (anaphora).
b. Ternary phrases.

*These techniques should be critically discussed in the essay.
*Harvard Referencing system is required.
*MS Word document is attached and it might be helpful.

Please note: My classmate will send you the same essay question to be written by you. The written essays should be different but about the same question.
Article by David Crystal: New Perspectives for Language Study. 1: Stylistics.
This Article might help in writing the essay.