Bush's attempts to avoid criticizing democrats haven't helped a whole hell of a lot so far. No matter what he does, he's going to be accused of running a dirty campaign, and if Kerry is currently running around with a guy who is falsely claiming to have served with him, it will do more good than harm to tell it to people. 'others' will be ignored by the media.
We'll have to agree to disagree on this one. And my guess is Bush will play it safe. You won't hear him personally attack Kerry's Vietnam record. You will hear him assail Kerry's pathetic Senate voting record, as he should.