May I recommend Paul Krugman's line as a potential slogan as well as "You Own It"?
I (and several others, I believe) have done diaries on this PK article over the past few days, but it really deserves consideration as a JK slogan and theme, since it goes to the heart of why Bush is unfit for re-installation, and weaves together all of the themes of the campaign so far (AWOL, Iraq, etc).
It's great virtue is that it makes the Rovian comebacks and smears that the Bushies use (such as the Swiftie campaign) work AGAINST them by returning the subject of conversation to Bush's dishonesty and its consequences for future policy.
How do we trust a man who lies about everything he does and has no integrity AT ALL?