The power of oratory in advancing a political candidacy for the Presidency,that no one expected to occur, is part of American history!
There have been four cases of people who were elevated to a Presidential nomination, and two of them to the White House, by the electrifying effect that a speech had on their political party and the nation at large!
Two of these were Democrats, and two were Republicans.
One of the Democrats was former Nebraska Congressman William Jennings Bryan, who delivered the “Cross of Gold” speech at the 1896 Democratic National Convention, with this leading to his Presidential nomination. Despite losing to William McKinley, Bryan went on to be the nominee of the Democrats two more times, in 1900 and 1908.
The other was Illinois State Senator Barack Obama, who gave a dynamic speech at the 2004 Democratic National Convention, arguing against a divided America, and calling for a united America, instead of a “red’ America and a “blue” America. It drew attention to him, and after being elected to the US Senate, he decided to campaign for the Presidency, and overcame many adversities to win two terms in the White House, but sadly saw “red” and “blue” America split ever further apart!
The first Republican was businessman Wendell Willkie, who despite no political experience, stirred the Republican National Convention of 1940 with his speech and charisma, and went on to become the nominee of his party, but losing to Franklin D. Roosevelt.
Ronald Reagan was the other Republican, making a well noticed speech on television in support of Arizona Senator Barry Goldwater, the GOP nominee for President in 1964. Goldwater lost in a massive landslide to Lyndon B. Johnson, but Reagan gained enough support and notice to run for California Governor in 1966, and eventually to be elected to two terms as President in the 1980s!
So the power of speech and charisma has had a great effect on American politics!