I hasten to disagree. Most things are clearly black and white. There is no moral relativism.
"I sought for the key to the greatness of America in her harbors...; in her fertile fields and boundless forests; in her rich mines and vast world commerce; in her public school system and institutions of learning. I sought for it in her democratic Congress and in her matchless Constitution. Not until I went into the churches of America and heard her pulpits aflame with righteousness did I understand the secret of her genius and power. America is great because America is good, and if America ever ceases to be good, America will cease to be great." -Alexis de Tocqueville
Stating that everything is not black and white is not moral relativism. It's simply the reality that you cannot delineate on most issues where exactly white becomes black. Some things can be easily said to be white and some easily black, but most issues are not clearly in one or the other. Gray does indeed exist in the real world.
The abortion issue is a case in point. Where does support for abortion in the case of rape, incest or life of the mother fall? What about morning after pills? What about those that support abortion only during the first trimester? Are they just as "black" as those that support abortion on demand during any period?