CREATE TABLE table_18146 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Results" TEXT, "Candidates" TEXT)

Who run for office in district Maryland 3?
SELECT "Candidates" FROM table_18146 WHERE "District" = 'Maryland 3'
SELECT "Candidates" FROM "table_18146" WHERE "District" = 'Maryland 3'