SEN. Hillary Rodham Clinton apparently has hit a speed bump on the way to her coronation. If Mrs. Clinton is to prevail in the general election she must, as in the primaries, divide to rule. She may get help from petulant conservatives. The polls make it clear that Mr. Giuliani is the Republican most likely to beat Mrs. Clinton. But his nomination could spark three splinter candidacies on the right. The first could be by a pro-life candidate who is offended by Mr. Giuliani's pro-choice views on abortion. This would be a clear case of cutting off one's nose to...