Bannon is going to be backing very popular candidates running on a nationalist economic agenda. You know, the same agenda that Trump ran on to victory. They will beat both the incumbent POS GOPer and any Democrap they is run against them. win-win-win.
Go Bannon, Go!
The one big risk here is that Bannon successfully topples incumbent Republican senators in primaries, only to have his nationalist candidates lose in the general election.
Bannon and Trump are playing Good Cop-Bad Cop with Mitch.
The end goal is to beat him into some deals.