THE CAMPAIGN FOR THE DFL NOMINATION FOR GOVERNOR IS IN ITS FINAL WEEK AND THE MISSION IS CLEAR FOR FRONT RUNNER SKIP HUMPHREY: WITHSTAND A WEEK OF ATTACKS FROM HIS 4 CHALLENGERS. MINNESOTA PUBLIC RADIO POLITICAL EDITOR BOB COLLINS HAS THE LATEST FROM YESTERDAY'S DAY OF CAMPAIGNING (Nfa NOTE: massage that any way you guys want). ANY QUESTION THAT THE DEMOCRATS HAVE DROPPED THEIR INFORMAL AGREEMENT TO BE RELATIVELY NICE TO EACH OTHER DURING THE PRIMARY CAMPAIGN HAS VANISHED IN THE LAST FEW DAYS.