Why do republicans have such a hard time discussing the middle cl of the USA economically?

Because they want to keep all the money for themselves. They know that if they start discussing the middle cl they will have to openly admit how terrible they've made it on us. Then they would have to really do something. Give us money, stop taking our jobs away to make a bigger profit.... or something. And oh no, they don't want to do that so they make it seem like what they're doing is the most important thing of all.