Full article here.
I want to extract a segment from it, so spoilers abound:
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Claire Danes is patently an incredible actress, and there’s one thing that she does better than any one else in the game, excepting “Breaking Bad’s” Bryan Cranston, who is a magician at this particular skill as well: convincingly, seamlessly conveying not just when Carrie Mathison is lying, but when Carrie Mathison is lying to herself.
Carrie, like Walter White, has many occasions to lie. Lying, and lying well, are part of the basic competency requirements of their job. We, in the audience, can hear when they’re doing it just from the tone in their voice. Both Carrie and Walt add a soothing register to their timbres when they are trying to get someone - Brody, Skyler - to do what they want. Carrie’s voice gets a little more innocent, a little happy-go-lucky, while Walt’s becomes flat out syrupy (he’s trying to cover up something much more disgusting than she is, after all).
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That's actually pretty fascinating! Especially since they also explicitly compare Carrie Mathison to Walter White and how similar their methods of manipulation are. :)