CREATE TABLE table_28947 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

What is the district with the candidates leven powell (f) 63.8% roger west (dr) 36.4%?
SELECT "District" FROM table_28947 WHERE "Candidates" = 'Leven Powell (F) 63.8% Roger West (DR) 36.4%'
SELECT "District" FROM "table_28947" WHERE "Candidates" = 'Leven Powell (F) 63.8% Roger West (DR) 36.4%'