ผู้ดำรงตำแหน่งของโอไฮโอ 12 คืออะไร?ไม่จำเป็นต้องใช้ตารางทั้งหมด
What is the incumbent for ohio 12?It is not neccessary to use all the tables.
 table_18595:  "District" [ text]  "Incumbent" [ text]  "Party" [ text]  "Result" [ text]  "Candidates" [ text] 
SELECT "Incumbent" FROM table_18595 WHERE "District" = 'Ohio 12'