CREATE TABLE table_72396 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

Name the first elected for abner j. mikva
SELECT "First elected" FROM table_72396 WHERE "Incumbent" = 'Abner J. Mikva'
SELECT "First elected" FROM "table_72396" WHERE "Incumbent" = 'Abner J. Mikva'