CREATE TABLE table_18203 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Status" CLOB, "Opponent" CLOB)

Who opposed Marty Meehan in each election?
SELECT "Opponent" FROM table_18203 WHERE "Incumbent" = 'Marty Meehan'
SELECT "Opponent" FROM "table_18203" WHERE "Incumbent" = 'Marty Meehan'