Question: What were the results for the incumbent from Iowa 2 district?
SQL: SELECT "Results" FROM "2-1805191-16" WHERE "District" = 'Iowa 2';

Question: Who is the incumbent that has been in office since before 1996 and was again Re-elected?
SQL: SELECT "Incumbent" FROM "2-1805191-16" WHERE "Results" = 'Re-elected' AND "First elected" < 1996.0;

Question: From which party is the incumbent who was first elected to office in 1990?
SQL: SELECT "Party" FROM "2-1805191-16" WHERE "First elected" = 1990.0;

Question: In what year did the Democratic incumbent that was Re-elected first take office?
SQL: SELECT "First elected" FROM "2-1805191-16" WHERE "Results" = 'Re-elected' AND "Party" = 'Democratic';