WASHINGTON (AFP) — Barack Obama set his sights on November's general election Saturday as he campaigned in Oregon, where he hopes to declare victory in the race for the Democratic presidential nomination. Obama has said Tuesday's primaries in Oregon and Kentucky could mark the end of his drawn-out battle with rival Hillary Clinton, and his campaign pressed home that message by announcing a symbolic return to Iowa that day. Iowa was the scene of the Illinois senator's first victory in the 2008 presidential nominating race, and his campaign noted Saturday it is "a critical general election state that Democrats must...