CREATE TABLE table_18205 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Status" CLOB, "Opponent" CLOB)

What parties are represented in Massachusetts4 district?
SELECT "Party" FROM table_18205 WHERE "District" = 'Massachusetts4'
SELECT "Party" FROM "table_18205" WHERE "District" = 'Massachusetts4'