Framing is an important element of communication.
If I was writing scripts for the current Dems in Denver convention, I think I'd using a phrase like "The doomed Bush-McCain legacy" to describe what is in opposition to Obama.
Obviously it frames McCain and Bush together, but also frames McCain's possible loss in November as a foregone conclusion, rooted in what are generally accepted as Bush's failed policies.
It's sort of like: Because Bush didn't fit, McCain ain't it.