CREATE TABLE table_18096 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

Who were the candidates when ed markey was the incumbent?
SELECT "Candidates" FROM table_18096 WHERE "Incumbent" = 'Ed Markey'
SELECT "Candidates" FROM "table_18096" WHERE "Incumbent" = 'Ed Markey'