Each has a prefect named in Paris, and sends three deputies and two senators more than 6,400 km (4,000 miles) to sit in the national legislature.
They actually send four senators and two deputies. 
mnli hypothesis: They actually send four senators and two deputies.  premise: Each has a prefect named in Paris, and sends three deputies and two senators more than 6,400 km (4,000 miles) to sit in the national legislature.