Many observers say Obama sounds like King. He does because he uses some of the same techniques that made King an electrifying speaker.

1. Parallel structure We can thank the ancient Greeks for this rhetorical tool—they called it "anaphora." It simply means repeating the same word or expression at the beginning of successive sentences or phrases. One of the most famous examples is King's "I Have a Dream" speech. "I have a dream that one day this nation will rise up and live out the true meaning of its creed…. I have a dream that… I have a dream…" Obama uses the same device frequently. In his Iowa victory speech on Jan. 3, Obama said, "You have done what the cynics said we couldn't do. You have done what the state of New Hampshire can do in five days. You have done what America can do in this new year."

Anaphora's sister technique is called "epistrophe." It is the repetition of a word or expression at the end of a successive sentences or phrases. For example, in Obama's New Hampshire speech, the expression "Yes, we can" rallied thousands of supporters when used like this: "It was a creed written into the founding documents that declared the destiny of a nation: Yes, we can. It was whispered by slaves and abolitionists as they blazed a trail towards freedom through the darkest of nights: Yes, we can. It was sung by immigrants as they struck out for distant shores and pioneers who pushed westward against an unforgiving wilderness: Yes, we can.