CREATE TABLE table_1342270_42 (district VARCHAR, incumbent VARCHAR)
SELECT COUNT(district) FROM table_1342270_42 WHERE incumbent = "Estes Kefauver"
 ผู้ดำรงตำแหน่ง Estes Kefauver อยู่ในกี่เขต?
In how many districts was the incumbent Estes Kefauver? 