[cnn-photo-caption image= http://i.l.cnn.net/cnn/2008/POLITICS/05/20/primary.wrap/art.split.candidates.ap.jpg caption=" Obama campaigned in Montana Monday while Clinton campaigned in Kentucky the day before the state's primary."]
(CNN) - It's all about location, location, location.
Sen. Hillary Clinton will spend Tuesday night in Kentucky to celebrate what's expected to be a big win in that state's primary. But Sen. Barack Obama won't be in Oregon, even though he's favored to win that state's contest Tuesday.
The Illinois senator will appear at a rally in Iowa, where he kicked off the primary season with a January 3 caucus win - a victory that helped propel him to Democratic front-runner status.
Iowa is also a swing state - one President Bush won by just 10,000 votes in 2004, and one the Democrats would love to win this November.
Obama told reporters Sunday that visiting Iowa "was a terrific way to kind of bring things full circle."