What will happen to Trump supporters going into the 2018 midterms should he lose

[#TheShadowyAbyss]

Will there be a push to nominate Trumpist candidates in the GOP?

[Maxwell]

Trump voters actually seemed to be establishment voters - Trump did very well across the board with conservatives and moderates within the Republican party. Trumpist primary candidates have done very poorly in this cycle and even people who supported Trump actually supported establishment candidates otherwise on the primary ballot (see: Paul Ryan smashing Paul Nehlen to bits, Trumpist support for Congressman Bill Shuster, Renee Ellmers landslide defeat, ect.)

[Ronnie]

After Trump gets routed, I expect (and hope) the base will consider Trump's candidacy as a traumatic event in the history of the party, and will shun any candidate who embraces him or any of the extreme positions he's taken.

[Heisenberg]

Probably not, considering that "establishment Republicans" (Young, Heck, etc.) did very well in Congressional primaries this year (and in 2014), despite Trump winning their states handily.

The Trumpist wave did not really hit downballot races, that's for sure. The Republicans have plenty of room to expand their Senate numbers in 2018, nominating candidates like Ann Wagner, Evan Jenkins, Sean Duffy, etc. make their chances for large gains really good.