The anti-war group that John Kerry was the principal spokesman for debated and voted on a plot to assassinate politicians who supported the Vietnam War. Mr. Kerry denies being present at the November 12-15, 1971, meeting in Kansas City of Vietnam Veterans Against the War, and says he quit the group before the meeting. But according to the current head of Missouri Veterans for Kerry, Randy Barnes, Mr. Kerry,who was then 27,was at the meeting, voted against the plot, and then orally resigned from the organization. Mr. Barnes was present as part of the Kansas City host chapter for the...