1. Rhetorical Devices Used by Speakers and Writers
Rhetorical devices are the nuts and bolts of speech and writing; the parts that make a communication work. Separately, each part is meaningless, but once put together they create a powerful effect on the listener/reader.

2. Parallelism
Writing structures that are grammatically parallel helps the reader understand the points better because they flow more smoothly.
If there is anyone out there who still doubts…who still wonders…who still questions

3. Hypophora
A common technique is to start a speech with a hypophora, in which the speaker first asks a question and then answers it.
In Obama’s speech, the word answer is used regularly as an obvious signpost of the speaker’s intention to give his audience answers. The questions, however, are implied here.

4. Repetition
Repetition can be effective in creating a sense of structure and power. In both speech and literature, repeating small phrases can ingrain an idea in the minds of the audience.
Yes, we can, to opportunity and prosperity. Yes, we can heal this nation. Yes, we can repair this world. Yes, we can.

5. Antithesis
A figure of speech in which sharply contrasting ideas are juxtaposed in a balanced or parallel phrase or grammatical structure
Obama is famous for having said “There are no red states or blue states. There are only the United States of America.”
"It was the best of times, it was the worst of times, it was the age of wisdom, it was the age of foolishness, it was the epoch of belief, it was the epoch of incredulity, it was the season of Light, it was the season of Darkness, it was the spring of hope, it was the winter of despair, we had everything before us, we had nothing before us, we were all going direct to Heaven, we were all going direct the other way." (Dickens, A Tale of Two Cities)

6. Tricolon
A tricolon is a list of three, or a sentence in which there are three parts or clauses. The cumulative effect of three has a powerful effect on an audience.

7. Polysyndeton
using several conjunctions in close succession, especially where some might be omitted—used to stress the importance of each item

8. Juxtaposition the act of positioning close together
Obama talks about the “not-so-young people who braved the bitter cold and scorching heat to knock on doors of perfect strangers”
The juxtaposition of “bitter cold” and “scorching heat” stresses the extreme conditions in which people campaigned for Obama, convincing the audience of their dedication
Function of Juxtaposition
Writers employ the literary technique of juxtaposition in order to surprise their readers and evoke their interest by means of developing a comparison between two dissimilar things by placing them side by side. The comparison drawn adds vividness to a given image, controls pacing of poem or a narrative and provides a logical connection between two various vague concepts.
In order to give us an idea of the factors responsible for the French Revolution, Dickens uses Juxtaposition throughout the novel in which the have not’s and the haves are put side by side to highlight the presence of severe disparity and discord in the then French society that paved the way for the revolution. By examining the given juxtaposition, readers can vividly imagine the calamitous atmosphere before the revolution and understand its need at that time.