After a stop at a solar technology company in this central Oregon town, Obama was asked if he supported a suggestion that he campaign with McCain and hold joint town hall meetings in the run-up to the November general election.

"I think that's a great idea. Obviously we'd have to think through the logistics on this," Obama said. "Should I be the nominee, if I have the opportunity to debate substantive issues before the voters with John McCain, that's something I'm going to welcome."