CREATE TABLE table_204_400 (id NUMBER, "district" NUMBER, "senator" CLOB, "party" CLOB, "caucus" CLOB, "first elected" NUMBER, "counties represented" CLOB)

which party has the most members ?
SELECT "party" FROM table_204_400 GROUP BY "party" ORDER BY COUNT("senator") DESC LIMIT 1
SELECT "party" FROM "table_204_400" GROUP BY "party" ORDER BY COUNT("senator") DESC FETCH FIRST 1 ROWS ONLY