CREATE TABLE table_18351 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

what is the party where the candidates are edward boland (d) unopposed?
SELECT "Party" FROM table_18351 WHERE "Candidates" = 'Edward Boland (D) Unopposed'
SELECT "Party" FROM "table_18351" WHERE "Candidates" = 'Edward Boland (D) Unopposed'