Trumpled (Alternative Leading)

[Lods]

It's seems arbitrary to assert one voter response is more valid as a popularity measure while the other is just a motivation of existing supporters, have I missed a point?

Here's my concern.
We really don't know the motivation of those extra10 million who turned out for Trump.
Some may have been Republican voters who failed to vote last time but thought they'd give it a go this time.
But some may have been 'new comers' turned or motivated by the events of the last four years.
I'm not sure how you get into the head of each and everyone of those folks.
It's probably fair to say those extra 10 million are less 'rusted on' than Trump's extremist base.
They'll either become more committed in the next few years or go back to the couch.

I reckon it's a big mistake on the Democratic side if those numbers (and the other 60 odd million) are ignored, dismissed or diminished because they represent a strong base for future Republican leaders to mount an assault on seats of power.