[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2008/images/09/26/art.obama.smile.ap.jpg caption=]
OXFORD, Mississippi (CNN) - On foreign affairs and national security, all Barack Obama has to do is convince people he's a safe alternative to John McCain. There are still a lot of doubts about his abilities to be commander-in-chief. McCain has to intensity those doubts concerning Obama. On the economy, Obama's remarks will sound like the following "Bush, Bush, Bush, Bush" McCain won't mention President Bush tonight. McCain's line on the economy will be "tax, tax, tax, tax."