Senator Edward M. Kennedy says he is not too worked up about the shape of the presidential race right now despite the fact that his junior colleague from Massachusetts is trailing in the polls. Meeting with reporters this morning, Mr. Kennedy, an ally of Senator John Kerry, exhibited his long memory about political events. He recalled that the polls were swinging wildly in the 1968 race between Richard M. Nixon and Hubert H. Humphrey and that Mr. Humphrey gained 10 points in a matter of days as the race went into the final stretch, though he ultimately lost a close...