The Wisconsin primary was a scramble anyhow, a frozen ordeal that started in February and cost the whole of March until the voting on the fifth of April. The Kennedys needed Wisconsin to prove that they could win in white-bread America. March is a lion of a month that far north among the Great Lakes prairies. There are no white-tie receptions in Wisconsin. All Hubert Humphrey, the straw opponent, had, really, was his bus to ride in and the fact that he seemed to understand these Finnish ice fishermen and Croatian-Slovene brewery workers, knew dairy politics and resort problems: This might be enough.