CREATE TABLE table_3186 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" TEXT, "Result" TEXT, "Candidates" TEXT)

When dennis ross (r) unopposed is the candidate what is the party?
SELECT "Party" FROM table_3186 WHERE "Candidates" = 'Dennis Ross (R) unopposed'
SELECT "Party" FROM "table_3186" WHERE "Candidates" = 'Dennis Ross (R) unopposed'