There are a few areas with large scale appeal that no one wants to touch: Free trade, Affirmative Action, and immigration. Very few like our jobs being sent overseas and most of us know China cheats and uses slave labor. But no one stands up to China. There is much dislike of AA which puts the majority population to the back of the line, often even behind recent immigrants. And most people understand that immigration these days is largely about cheap labor and hurts the country except employers. And btw recent immigrants rarely vote Repub (ask Sen Amnesty McCain)!
So why don't Repubs use some of those issues? Apparently our elite secretly love all the above and can't bear to take them up!