The republican parties door is wide open to diversity, but so is the Democrat party as well. It's just that one party represents certain values and standards that differ from the other party (not about skin color).
The reason Martin Luther Kings movement made such great progress in the past, is because it was all based on faith, a belief in Christ, and in that belief, there were values and standards being desired by black people (that were being illustrated by white's and black's at the time), in which most black's agreed upon and wanted unification on as well in America.
If white's were these evil monsterious people that were incapable of acceptance of other's, then we wouldn't have or see the diversity that we have today in America. And don't think for a second that it's all because of the government that we have what we have today, because that would be a lie and a deceiving of one's own mind. It was all reformed due to man's conscious that God gave him to do the right thing in concerning his fellow man in this world, and this once the negative results were born out of doing the wrong thing in this world. We have freedom, but we have huge responsibilities when it comes to our God given freedom's.
The deception by the evil one will exist here unto the end, and we must understand this always. Let it not be that we fall into the traps being laid, and so we must keep our eyes on the prize folks.