McCain could do a town hall meeting and have a cardboard cut out (full-size) of Obama on the stage with a microphone pointed at it.
McCain should then NEVER REFER TO IT...until the end of the session:
“Before we go, Senator Obama, do have anything you’d like to add?”
I like it. Hammer Osbama and have fun with it. When/if the MSM tries to make an issue of it. McCain could use it to hammer the point home further. Win win.