Washington (CNN) The whispers began within minutes of the release of CNN's new national poll on the 2020 field: Is something wrong with Sen. Kamala Harris' campaign?

The poll showed the California Democrat dropping from 17% (and in second place) in a June CNN survey to 5% (and tied for fourth) now.

Which is not good! And the poll numbers come on top of the fact that Harris has now come under fire from Sen. Bernie Sanders of Vermont for her ongoing struggle to make clear where she stands on "Medicare for All."

But before any of her supporters panic, they should take a deep breath and a step back. Here's why.

The CNN June poll was in the field June 28-30. That was hard on the heels of the second night of the first Democratic debate -- a debate in which Harris was the clear star, scoring a direct hit on former Vice President Joe Biden by attacking his record on school busing.

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