Our business already includes one John whose namesake signed the Declaration of Independence. (Good day to you, Mr. Penn.) But now we have another, this time on four legs, bidding to confirm that Constitution--if not a founding father--is certainly a patriarch in the making. Yet if the Sam F. Davis Stakes winner were to carve his "John Hancock" on the GI Kentucky Derby roll of honor, he would only be further magnifying two names whose Churchill achievements are already outsized. One is that of his dam Scribbling Sarah (Freud), who...