Message not being sent to all connections Python
===

I am new to Threading and Sockets in general so please bare with me. I am trying to write a program that allows for multiple connections and the server operator can send messages to all the connected clients. I have sorted out the problem of allowing multiple connections using simple threading, now my problem is the message doesn't send to all the connected clients all at once, I have to send the message multiple times to send it to ever client.

    def send(add, conn, port, s):
        while True:       
            message = raw_input("Message: ")
            add.send(message)

    def server(port):
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.bind(('', port))
        s.listen(10))
        print "Waiting for connections..."
        while True:        
            a,b = s.accept()
            print b, "connected"
            connections.append(b)
            thread = threading.Thread(target=send, args=(a, b, port, s))
            thread.start()
            threads.append(thread)

Thanks