THE President's disclosure of his efforts to end the war was a timely move, judging by a recently conducted poll. Though many Republicans thought Viet Nam as an issue was largely defused, a survey by Cambridge Opinion Studies of 1,561 households revealed that 42% of the voters now regard Viet Nam as a "leverage" issue, that is, one important enough to determine how they will vote. Six months before, only 26% of the voters considered the war a key issue.
The poll has particular meaning for the White House because Cambridge is a Manhattan-based firm that undertakes political studies only for Republicans....