DAVID MARCUS: Kamala Harris' newest vibe is fading momentum

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Polling is a useful tool in politics, if somewhat blunt and slow, and this weekend Democrats were taking no small comfort in an ABC/Ipsos survey showing Kamala Harris leading Donald Trump by 4 points nationally.

But the important thing about this poll is not the margin. After all, Rasmussen has Trump up by 2 points. Nobody knows which is right. What’s important is that on Aug. 13, this same ABC poll also showed Harris up 4. Put another way, Harris' momentum isn’t just gone, it's been gone for a while.

MARGIN OF ERROR RACE BETWEEN HARRIS AND TRUMP AS 2024 ELECTION ENTERS FINAL STRETCH

I first clearly felt the air escaping the Harris balloon a little more than a fortnight ago, in San Francisco of all places, where one would think she’d be viewed as a hometown hero. But already, from almost everyone I met, there were creeping questions as to what she stands for, what she would do as president.

We have all seen the viral videos, even from the Democratic National Convention, of delegates asked what their favorite Harris policy is, only to stare off into the distance, looking for an answer that isn’t there as if they had been asked to conjugate some word in ancient Greek.

I have now seen this expression more times than I can count, in red states, in blue states, in suburb, city and small town, even many of those committed to vote for the vice president admit it is kind of like buying a political scratch-off ticket. They aren’t sure what they are going to win.

Now, make no mistake, from the time that Nancy Pelosi shoved President Joe Biden, face first, off of the stage until just before the Democrats gathered in Chicago, the momentum was there, the vibes were real, and Harris’ numbers were