Cook pasta according to package directions until almost tender (7-12 minutes); drain. Rinse with cold water, drain. Pour pasta in 6-quart mixing bowl; toss with 16 ounce bottle dressing. Blanch broccoli in boiling water to cover 2 minutes; drain. Rinse with cold water, drain. Toss broccoli, onions, carrots, green pepper, artichoke hearts and salt into pasta. Refrigerate, covered, several hours or overnight. Just before serving, toss in tomatoes and additional dressing.