ทิม โฮลเดนดำรงตำแหน่งในเขตใด?ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
In what district was Tim Holden the incumbent?It is not neccessary to use all the tables.
 table_1341453_40:  (district [ VARCHAR ] incumbent [ VARCHAR) ]
SELECT district FROM table_1341453_40 WHERE incumbent = "Tim Holden"