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

number of state senators first elected in 2002
SELECT COUNT("senator") FROM table_204_400 WHERE "first elected" = 2002
SELECT COUNT("senator") FROM "table_204_400" WHERE "first elected" = 2002