From NBC's David Gregory
From a top Obama source -- He will appear soon to say debate should go on .. perhaps the subject matter can be augmented to include discussion of the economy, but a president should be able to multi-task.
This source says the only thing that has changed is McCain's standing in the polls.
It's clear from speaking to Obama advisers they consider this a ploy by McCain to try to assert that he's putting country first. One adviser said, the time to do that was long before a few days before a debate.