John Murphy dissects the Barack Obama's speeches so you can follow his steps..
Order and make sense of the world. Structure in a speech clarifies the world for the audience. The speaker wants to make the world in the speech as organized as he hopes he can make the world for the audience.
Explain problems and lay out solutions. Anytime you bring up a problem in a speech, people sort of expect a solution. Here's the difficulty we face, here's the solution, and here's how it will work. Structure, tone, known phrases.
Talk to voters like responsible adults. Obama trusts the rationality of the American people. He trusts that if he explains things clearly, they will respond to him. So, include a significant amount of evidence, make claims, make arguments, but be inspirational and soaring.