Why is Kamala Harris the only one smiling at the 9/11 memorial?

Why is Kamala Harris the only one smiling at the 9/11 memorial?

At this year's 9/11 Memorial Remembrance, why is Kamala Harris the only one smiling? She also was the only one waving at people. Whether you like her or not, is that the correct way for a possible future President to pay respects to the 3000 people who died in the 9/11 terrorist attacks?

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The picture us a snapshot of a video taken of Harris and nearby people at the start of the memorial ceremony.
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Some seem to believe that this is a fake photoshopped picture. It is a cropped still picture taken from a video taken on C-SPAN. You can watch the entire video here...
x.com/.../1833848762579751392
Why is Kamala Harris the only one smiling at the 9/11 memorial?
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