CREATE TABLE table_18638 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

How many incumbents were first elected in 1930?
SELECT COUNT("Party") FROM table_18638 WHERE "First elected" = '1930'
SELECT COUNT("Party") FROM "table_18638" WHERE "First elected" = '1930'