Via The Charisma Myth: How Anyone Can Master the Art and Science of Personal Magnetism:

• Speak slowly. Visualize the contrast between a nervous, squeaky teenager speaking at high speed and the slow, emphatic tone of a judge delivering a verdict.

• Pause. People who broadcast confidence often pause while speaking. They will pause for a second or two between sentences or even in the middle of a sentence. This conveys the feeling that theyâre so confident in their power, they trust that people wonât interrupt.

• Drop intonation. You know how a voice rises at the end of a question? Just reread the last sentence and hear your voice go up at the end. Now imagine an assertion: a judge saying âThis case is closed.â Feel how the intonation of the word closed drops. Lowering the intonation of your voice at the end of a sentence broadcasts power. When you want to sound superconfident, you can even lower your intonation midsentence.

• Check your breathing. Make sure youâre breathing deeply into your belly and inhale and exhale through your nose rather than your mouth. Breathing through your mouth can make you sound breathless and anxious.

Want your voice to to convey more warmth? Just smile:

Thereâs only one thing you need to do in order to project more warmth in your voice: smile. Smiling affects how we speak to such an extent that listeners in one study could identify sixteen different kinds of smiles based on sound alone. This is why itâs worth smiling even when on the phone.

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Fascinating that several of these foundations of rhetoric -- speaking slowly and deeply, with pauses, while smiling -- is what I've come to associate with speakers from America's South do.

Examples are politicians like Bill Clinton and George W. Bush.

What's interesting is that both Obama and Romney are not from the South, but they've also adopted these speaking patterns.