CREATE TABLE table_59231 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Results" CLOB)

What is the lowest First Elected, when District is 'Massachusetts 10'?
SELECT MIN("First elected") FROM table_59231 WHERE "District" = 'massachusetts 10'
SELECT MIN("First elected") FROM "table_59231" WHERE "District" = 'massachusetts 10'