6. How do McCarthy's references to Abraham Lincoln at the beginning and end of his speech support his argument?

McCarthy's references to Abraham Lincoln at the beginning and end of his speech likely support his argument by invoking Lincoln's legacy and authority to lend credibility and resonance to his own message. Lincoln is often revered for his leadership, moral clarity, and ability to unite a divided nation, so by associating himself with Lincoln, McCarthy could be seeking to align his own ideals and goals with those historically upheld by Lincoln, thus bolstering his argument and appealing to the audience's sense of tradition and patriotism.