CREATE TABLE table_2147 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

In what district is the incumbent John Linder?
SELECT "District" FROM table_2147 WHERE "Incumbent" = 'John Linder'
SELECT "District" FROM "table_2147" WHERE "Incumbent" = 'John Linder'