CREATE TABLE table_18099 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

What was the earliest year someone was first elected from Massachusetts 3
SELECT MIN("First elected") FROM table_18099 WHERE "District" = 'Massachusetts 3'
SELECT MIN("First elected") FROM "table_18099" WHERE "District" = 'Massachusetts 3'