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The author of the article is ignorant -- there are no models supporting Trump's victories.

Here are the midterm results since Carter for each POTUS' 1st term:

Midterm House results for POTUS' 1st term
==========================================

Year  Dem  Rep    Dem +/-  President / Note
----  ---  ---    -------  -----------------------
1978  277  158    119+     Carter / Post Watergate
1982  243  192     51+     Reagan
1990  267  167    100+     Bush Senior
1994  204  230     26-     Clinton
2002  205  229     24-     Bush Junior / 911
2010  193  242     49-     Obama / ACA
2018  235  199     36+     Trump

Only on the heals of 9/11 does Trump fall behind Bush Jr -- otherwise, Trump holds a commanding midterm lead above Reagan and Bush Sr.

Excluding the patriotic impact of 911, Trump's midterm loss is 2nd best to Clinton's who lost the fewest House seats since Carter.