CREATE TABLE table_1529793_1 (primary_sponsor_s_ VARCHAR, driver_s_ VARCHAR)

Who is Jason Leffler's primary sponsor?
SELECT primary_sponsor_s_ FROM table_1529793_1 WHERE driver_s_ = "Jason Leffler"
SELECT "primary_sponsor_s_" FROM "table_1529793_1" WHERE "Jason Leffler" = "driver_s_"