(CNN) - Despite Sen. Barack Obama's commanding lead in the delegate count, Sen. Hillary Clinton campaigned hard Sunday, telling voters she's "running for the toughest job in the world."
Clinton spent her weekend in Kentucky, which, along with Oregon, holds its Democratic contest Tuesday.
Clinton is favored in Kentucky, while polls show Obama with a comfortable lead in Oregon.
Speaking in Bowling Green, the senator from New York said it was a "treat" to have the whole state to herself since Obama would not be returning there.
Clinton has faced calls to drop out of the race since she trails Obama across all fronts - pledged delegates, superdelegates and the popular vote.
Clinton has recently been claiming a lead over Obama in the popular vote, a debatable claim, especially because the Democratic National Committee doesn't count the votes of Florida and Michigan, which Clinton does.
Florida and Michigan were stripped of their delegates for scheduling their primaries too early, and Clinton was the only top-tier candidate whose name was on the ballot in Michigan.
Clinton's campaign also excludes the caucus states in their popular vote count.