On September 30, Barry Commoner died at the age of 95. See this New York Times obituary. He was one of the founders of the Citizens Party in 1980, and its presidential nominee that year. Many present-day Green Party activists first became active in electoral politics within the Citizens Party. The logo for the Citizens Party in most states was a pine tree. Thanks to Darcy Richardson for the link.
Some presidential nominees are still living from the presidential elections of 1968, 1972, 1976, and 1980, including Dick Gregory from 1968, Linda Jenness from 1972, Jimmy Carter from 1976 and 1980, and John Anderson from 1980.