CREATE TABLE table_3625 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" TEXT, "Result" TEXT, "Candidates" TEXT)

What party represents the district with john g. jackson?
SELECT "Party" FROM table_3625 WHERE "Incumbent" = 'John G. Jackson'
SELECT "Party" FROM "table_3625" WHERE "Incumbent" = 'John G. Jackson'