From the left: Major Garrett, Jim Kessler of the think tank Third Way, and David Gergen, senior political analyst at CNN, participate in the Compare the Candidates event in Charlotte, North Carolina, September 4, 2012.National Journal

David Gergen, a political commentator who has served in both Republican and Democratic administrations, said on Sunday that, with just two days left, the presidential race is beyond tight.

"I don't think it's too close to call," Gergen said on CBS's Face the Nation. "I think it's impossible to call."

Gergen said that, from afar, polls indicate the president is in the lead. But on the ground, he argued, the enthusiasm for Republicans is much stronger.

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