This, for me, is why I find the concept of Christian=Republican so offensive. The party has allowed its extreme wing to limit the discussion of morality to one based on only two concepts...abortion as murder and Gay-rights as sexual immorality (I won't even limit that to Gay marriage). To hear that these are the issues that define the political Christian...it hits my ears as being told, "Black Christian Democrats...you simply aren't as Christian as we are over here on the Right." I would bet Latinos hear the same. If one limits the spectrum of Christian values to two, loud, oversimplified issues, then yes, liberal church-going minorities are mostly heretics...an affront to the body of Christ--however, if you consider the entire Bible, minorities simply prioritize mandates from God differently.
I'm willing to throw out a guess here...minorities classify abortion like they do war...an unfortunate solution to a social problem that can have consequences that no-one desires. I personally see Black churches prioritizing other social issues over abortion no differently than I see the White church doing the same with the death penalty, military occupation of and conflict in so many other nations. All result in death...more clearly in the case of war and execution because the point of origin of life is among dispute even within the church (apparently the idea that life begins at conception only became a rallying cry of the church in the late 70s...1970s). I'll be honest...I used to have pangs and questions over supporting candidates/parties that were more liberal in their social stances. I still ask the questions...I still sometimes wonder if I am wrong--but I will suffer no more lost sleep over the prospect of babies dying than I will the promise of adults.
While I find the racial segregation of the American church profoundly disheartening and telling, I believe it also offers unique insight to all Christians in the US--an opportunity to more clearly see where earthly cultural norms have polluted our vision of God's word--that, however, is only if we are willing to let go of the sin of pride manifested as prejudice and inclinations toward cultural oneupsmanship and accept that Jesus is the only hard-line requirement in getting to heaven.