Question: What are incumbent William Vandever's results?
SQL: SELECT "Result" FROM "2-1431450-2" WHERE "Incumbent" = 'William Vandever';

Question: Who was the first person elected from Democratic gain?
SQL: SELECT "First elected" FROM "2-1431450-2" WHERE "Result" = 'Democratic gain';

Question: What was the result for incumbent Joseph McKenna who was first elected in 1884?
SQL: SELECT "Result" FROM "2-1431450-2" WHERE "First elected" = '1884' AND "Incumbent" = 'Joseph McKenna';

Question: When was Republican incumbent Joseph McKenna first elected?
SQL: SELECT "First elected" FROM "2-1431450-2" WHERE "Party" = 'Republican' AND "Incumbent" = 'Joseph McKenna';