Kaohsiung Mayor Chen Chu (left) and Beijing Mayor Guo Jinlong pose for a photo Thursday during Chen Chu's visit to Beijing. Her four-day trip will also take her to Shanghai.  A senior figure in Taiwan's main opposition party began a landmark visit to the mainland Thursday, declaring "she was bringing a new voice". Chen Chu, mayor of Kaohsiung - the island's second-biggest city - is the highest-ranking official from the Democratic Progressive Party (DPP) to set foot on the mainland.[CFP]