CREATE TABLE table_18129 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Results" CLOB, "Candidates" CLOB)

Who were the candidates in district Pennsylvania 3?
SELECT "Candidates" FROM table_18129 WHERE "District" = 'Pennsylvania 3'
SELECT "Candidates" FROM "table_18129" WHERE "District" = 'Pennsylvania 3'