CREATE TABLE table_18162 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" CLOB, "Results" CLOB, "Candidates" CLOB)

In what district was Tim Holden the incumbent?
SELECT "District" FROM table_18162 WHERE "Incumbent" = 'Tim Holden'
SELECT "District" FROM "table_18162" WHERE "Incumbent" = 'Tim Holden'