Former Obama campaign manager Jim Messina and GOP Communications consultant Brett O’Donnell preview the highly anticipated presidential debate on ‘Fox News Sunday.’

How important is Tuesday night’s debate between former President Donald Trump and Vice President Kamala Harris? Extremely important: based on the evening’s face-off in Philadelphia, voters could well decide who becomes the next president of the United States.

Why such drama? Because Vice President Kamala Harris adopted, weeks ago, a ridiculous campaign strategy of hiding from voters as much as possible and committing to few policies; she has refused to do solo interviews or press conferences and until Monday had neglected to post any policy positions on her campaign’s website. Unlike every other candidate in recent history, she did not endure a grueling primary contest to win her slot on the ballot. She was, instead, anointed by Democratic Party power brokers.

As a result, 28% of voters in a recent New York Times/Siena poll said they "still need to learn more about Kamala Harris," while only 9% said they needed more information about Donald Trump.

TRUMP ALLIES OFFER DEBATE STRATEGIES TO BEAT HARRIS: 'ALREADY KNOCKED ONE DEMOCRAT OUT'

That puts tremendous pressure on Harris to define herself in a winning way before Tuesday night’s audience. The first face-to-face between former Sen. Hillary Clinton and Donald Trump in 2016 drew 84 million viewers; Tuesday’s debate could attract even more.

Harris and her team are feeling the pressure. They have engaged in considerable bickering about the rules of the debate, hosted by ABC News,........

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