President speaks to America for 43 minutes about Vietnam and his attempts at peace negotiations. He says the bombing of North Vietnam will be reduced. He announces he will not run for reelection in November. Anchor Edwin Newman evaluates the speech. Senators Walter Mondale, Henry Jackson, and Clifford Case comment. Also reporting for NBC News are Herb Kaplow, Elie Abel, Ray Scherer, and Charles Quinn. Also, an excerpt from CBS News on the speech. Roger Mudd and Dan Rather comment.