A “Sucker Punch” is when someone poses as a friend and then when they get close they knock you to the ground with their fist.
So when right-wing ideologues and organizers suggest a coalition on any topic other than broad-based civil liberties, just say no.*
Why? Read the following:
Right Woos Left:
Populist Party, LaRouchite, and Other Neo-fascist Overtures To Progressives, And Why They Must Be Rejected
* The exception is important, because civil liberties for all is what allows democracy to be built in the first place