President-elect Barack Obama is expected to announce his final cabinet picks today. Aides say Obama has selected former Dallas mayor Ron Kirk as US trade representative and Congress member Hilda Solis of California as Labor Secretary. Kirk and Solis have been on different sides of the trade debate. Solis has been a leading congressional voice for labor rights. In Congress, she is a key backer of the Employee Free Choice Act, which would remove barriers to unionizing workers.