CREATE TABLE table_767 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" TEXT, "Result" TEXT, "Candidates" TEXT)

Name the first elected for lost renomination democratic loss
SELECT "First elected" FROM table_767 WHERE "Result" = 'Lost renomination Democratic loss'
SELECT "First elected" FROM "table_767" WHERE "Result" = 'Lost renomination Democratic loss'