CREATE TABLE table_18330 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

What is the district that has Bob Wilson as an incumbent?
SELECT "District" FROM table_18330 WHERE "Incumbent" = 'Bob Wilson'
SELECT "District" FROM "table_18330" WHERE "Incumbent" = 'Bob Wilson'