Rep. Christian Menefee (D-Texas) is projected to defeat Rep. Al Green (D-Texas) in a Democratic primary runoff for the Houston-based 18th Congressional District, according to Decision Desk HQ.  Menefee, the 37-old-lawmaker who won a special election to fill the remainder of the late Rep. Sylvester Turner’s (D-Texas) seat in January, is almost certain to win…