Right you are
I have yet to hear from anyone who saw this ad cold who didn't think, until the last part, that it was a McCain ad.
I haven't seen it -- don't watch TV, even now -- but I've heard it plenty, in stories on NPR about the ad itself... and I was struck with the very same impression.
Remember this? The "daisy girl" ad from LBJ's '64 campaign against Goldwater.