Final answer:
The paraphrased inclusion of Roosevelt's quote about 'men in the arena' in Nixon's speech likely aims to present Nixon as a dedicated public servant facing adversity, aligning him with Roosevelt's celebrated values of bravery and effort while creating a sense of unity with his audience.
Step-by-step explanation:
The paraphrased inclusion of Theodore Roosevelt's quote about "men in the arena" in a speech often serves the purpose of invoking the theme of bravery and persistence in the face of adversity. For Richard Nixon, referencing such a powerful and revered statement would likely contribute to the central idea of his speech by aligning himself with the dignified struggle that Roosevelt celebrates. The quote suggests valor and effort in public service, which Nixon could have been using to position himself as a tireless worker for the nation, despite criticisms or setbacks. By invoking Roosevelt, Nixon also nods to a sense of historical continuity and shared values with his audience, framing his own efforts and leadership within a grander American narrative of perseverance and determination.