What is Kamala Harris' appeal?

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Her victory speech was pretty strong.

Also correction, she isn't really all that young. If she won, she would be the oldest newly elected Democratic President since James Buchanan.

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She's a female Obama.  She's not what's going to carry the day against Trump in 2020, however. 

Trump can only be beaten if the 2020 electorate views him as incompetent.  In that case, beating him will require a Democrat with significantly more experience at the Governor/Senator/Cabinet level than Kamala Harris has. 

It's hard to argue that Harris is inexperienced, considering she was attorney general of California for six years, and district attorney before that.

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The "resistance" to Trump is being crystallized; the "resisters" are seen as in the minority versus a "silent majority".

...Have you seen his approval ratings?

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The "resistance" to Trump is being crystallized; the "resisters" are seen as in the minority versus a "silent majority".

...Have you seen his approval ratings?

He's underwater, 43%-51% according to Gallup.  As he was when he was elected.

I don't see where the Democrats are significantly more popular.  I also remember Obama's approval rating when Trump was elected.

Democrats are winning generic ballot polls by a significant margin.

Also Obama wasn't running in 2016. My point isn't that Democrats are guaranteed to win in 2020 (I don't think they are) just that your assertion that Trump supporters are a "silent majority" is ridiculous.