JUDICIOUS NOMINATION: It appears that the nomination of Charles Pickering of Mississippi to the Fifth Circuit Court of Appeals (made famous in the Oliver Stone conspiracy film J.F.K.) has been scuttled. Is this defeat for President Bush payback for the hard time Senate Republicans gave President Clinton in confirming his nominees? Or does it simply mean that a judge who makes a decision that might upset others, should bid his future in public service adieu? Granted, any judicial decision involving the Klan or civil rights properly warrants especial attention; but given the overwhelming support for Mr. Pickering in his own state, and endorsement of political figures on both sides in Mississippi (including his local N.A.A.C.P. Chapter), could the motivations of U.S. Senators have been something more?