I think it is absolutely non debatable that there were a significant number of "Trump Democrats" throughout most States and Counties within the US.
It is mathematically impossible to explain various swings in counties and precincts without the existence of a significant number of voters that went Obama in '08 and/or '12, and then voted Trump in '16.
Now---- I think where it gets tricky is looking at the partisan affiliation of such voters in '16. How many of them were registered Republican, Democrat, Independent when they voted in '16?
I completely agree with the concept that many of these voters went for George W. in '00/04. In fact, my own detailed precinct analysis from Oregon appears to support that argument. So yes, the provocative headline does have merit, in that the votes for Obama were the exception and not the norm in many of these counties/cities that swung heavily towards Trump.
Still, despite the articles massive claim, it's essentially just describing many classic swing voters that have shifted back and forth over the past three decades, and not really contributing anything new that those of us on Atlas haven't already been looking at for years.
I think your mostly right but there are gore/Kerry/Obama/Obama/trump voters just look at COOS COUNTY OREGON NORTHERN MAINE a lot of MN and IA and WV and WI AND MI AND OHIO AND PA AND SOUTHWESTERN WASHINGTON but like I said your mostly right