Barack Obama turned his focus to the expected presidential contest against Republican John McCain, but Hillary Rodham Clinton tried to keep her campaign afloat even though her Democratic rival has an almost insurmountable lead in the delegate count. Clinton spent Sunday wooing voters in West Virginia ahead of Tuesday's primary, aiming for a big win that she hopes will keep her campaign afloat. Obama, inching closer day by day to claiming enough delegates to secure the nomination, was spending the Mother's Day holiday off the campaign trail at home in Chicago. Obama's chief strategist said in a television interview Sunday that his campaign is considering a suggestion from McCain's campaign for the two presidential hopefuls to participate in joint town meetings and debates around America starting this summer. Asked on "Fox News Sunday" about the suggestion and how seriously it was being considered, David Axelrod said: "Very seriously. ... We believe that is the most significant election we've faced in a long time." "We're at war. Our economy is in turmoil. And we've got so many challenges that the people of this country deserve a serious discourse, and it shouldn't be limited necessarily to three kind of very regimented debates in the fall," he added, referring to those sanctioned by a presidential commission.