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The three movement specialists have monitored the physical charisma and body language of the presidential field hopefuls since 2006. Their work will continue to Election Day, and is particularly attuned to telling changes in candidate behaviors - particularly role reversals. Imagine, say, a breezy Mr. McCain and a strident Mr. Obama.

“The most important question for the American people will be, ‘What will we know about each man by November?’” Ms. Bradley said.