ReutersWorld stocks get twitchy before Trump-Clinton showdownReutersPedestrians walk pass an electronic board showing the Japan's Nikkei average (R) and other stock market indices outside a brokerage in Tokyo, Japan, February 29, 2016. REUTERS/Yuya Shino. 2/2. left. right. Traders work at their desks in front of the ...U.S. Stocks Retreat With European Shares Amid Anxiety Over BanksBloombergMARKET SNAPSHOT: U.S.