Trump's base

"So maybe Trump’s base is angry, fairly affluent white racists — sort of like The Donald himself, only not as rich? And maybe they’re not being hoodwinked?"
Tea and Trumpism
The New York Times

It does not appear to me that they are "fairly affluent", even if they are white racists.
I don't think Krugman's guess is right. Tea Party supporters and Trump supporters are a little different.