There is a Biblically-based side of the argument that abortion -- though wrong -- is not murder. The argument does not condone abortion, it simply argues that the Bible does not support the charge that it is murder.
It is significant to note the existence of such a difference of opinion as to what the Bible says about abortion. Why?
Because it underscores the danger of letting any group co-opt the powers of federal government to impose its idea of what the Bible (or any religious text) says on others -- at the point of government guns.