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How Body Language Can Spell Victory Or Defeat For Clinton, Trump

PHILADELPHIA (CBS) -- Experts say that depending on who wins Monday night's debate, it will all come down to body language. The analysis of that body language starts the moment both candidates come on stage and offer each other that handshake.

More than 100 million people, one in three Americans, could tune in to watch the first debate between Hillary Clinton and Donald Trump.

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"A lot is riding on this for both the candidates tonight," said Villanova communications professor and body language expert Dr. Susan Mackey-Kallis and she says there is no clear favorite to win on Monday night.

"Really it's either of the candidate's debate to lose," she said.

She believes Clinton must appear engaged and interested in what Trump is saying, avoiding the sighing and eye-rolling that lost Al Gore the debate in 2000.

"She's got to be really careful not to come off as being overly angry, or obviously dismissing him as a candidate.

Trump, is a different story.

"The Donald is the Donald, so no one is going to expect him to be controlled in his non-verbals." Dr. Mackey-Kallis believes Trump will attack Clinton, but it's how he attacks her which could determine whether or not he wins.

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"I think there's a lot of gender dynamics going on here," Dr. Mackey-Kallis said. "She can't seem to aggressive, but he can't seem to be so specifically targeting her as a woman."

There are still some undecided voters in this and the experts say body language from the candidates could influence who they vote for.

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