Table:
text: United States House of Representatives elections, 1938
Louisiana
Louisiana
District Incumbent Party First_elected Result_ Candidates
Louisiana 1 Joachim O. Fernandez Democratic 1930 Re-elected Joachim O. Fernandez (D) Unopposed
Louisiana 2 Paul H. Maloney Democratic 1930 Re-elected Paul H. Maloney (D) Unopposed
Louisiana 3 Robert L. Mouton Democratic 1936 Re-elected Robert L. Mouton (D) Unopposed
Louisiana 4 Overton Brooks Democratic 1936 Re-elected Overton Brooks (D) 99.6% Ben Neal (I) 0.4%
Louisiana 5 Newt V. Mills Democratic 1936 Re-elected Newt V. Mills (D) Unopposed
Louisiana 6 John K. Griffith Democratic 1936 Re-elected John K. Griffith (D) Unopposed
Louisiana 7 René L. De Rouen Democratic 1927 Re-elected René L. De Rouen (D) Unopposed

Question: In which district is incumbent Robert L. Mouton from the United States House of Representatives election, Louisiana 1938 ?