During the 2004 Presidential Debate between George W. Bush and John Kerry

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During the 2004 Presidential Debate between George W. Bush and John Kerry campaign a young female college student asked John Kerry about abortion and his political position on this issue. Kerry responded first by asserting that he is a Roman Catholic and that he did not endorse or feel good about the practice; but he added that he also believed that “articles of faith”, by which I presume he meant a religious belief about the moral status of abortion, are not matters of legislation or law (a position I fundamentally agree with). Kerry’s response seems to assume that morality, or at least morality based on religion, should not be a part of law; however, it also appears to me that it is difficult to imagine where law would derive its power if not from some kind of (religious?) moral basis. I have been trying to see how Kerry’s comment is intelligible in light of the dilemma of how laws would have any kind of power, or that there would be any justification for their authority, without some kind of moral basis upon which law is built.