Umno presidential candidate Tengku Razaleigh Hamzah said arrogance is one of the biggest stumbling blocks of the party, and if he is elected as the new party president, he will fight for change. The Gua Musang MP said this after a debate session with two other contenders for Umno presidency, Khairy Jamaluddin and Datuk Seri Dr Ahmad Zahid Hamidi, on Friday night.