China's Xi arrives in Washington for first U.S. state visit

By Matt Spetalnick and Jeff Mason WASHINGTON (Reuters) - Chinese President Xi Jinping arrived in Washington on Thursday for a state visit and talks with President Barack Obama expected to be clouded by differences over alleged Chinese cyber spying, Beijing's economic policies and territorial disputes in the South China Sea. Vice President Joe Biden led the welcoming delegation as Xi's plane touched down at Andrews Air Force Base on the second leg of a weeklong trip that began in Seattle, where t