Table:
text: United States House of Representatives elections, 1918
Arkansas
Arkansas
District Incumbent Party First_elected Result_ Candidates
Arkansas 1 Thaddeus H. Caraway Democratic 1912 Re-elected Thaddeus H. Caraway (D) Unopposed
Arkansas 2 William A. Oldfield Democratic 1908 Re-elected William A. Oldfield (D) Unopposed
Arkansas 3 John N. Tillman Democratic 1914 Re-elected John N. Tillman (D) Unopposed
Arkansas 4 Otis Wingo Democratic 1912 Re-elected Otis Wingo (D) Unopposed
Arkansas 5 Henderson M. Jacoway Democratic 1910 Re-elected Henderson M. Jacoway (D) Unopposed
Arkansas 6 Samuel M. Taylor Democratic 1913 Re-elected Samuel M. Taylor (D) Unopposed

Question: When was incumbent John N. Tillman first elected in the United States House of Representatives election, 1918 in Arkansas. ?