I just saw this ad. a few moments ago. I suppose it's a good sign that the Romney team got the updated ads out this quickly, but "Comeback Team" may not be the ideal slogan. It could be read as :the team to lead America's comeback." That's OK but it's not the first reading that comes to mind.
When I see the phrase "Comeback Team," I normally think "sure, we're behind but don't count us out." That may be a realistic message but I don't think it's one the campaign wants to push.