I think McCain made a huge strategic error. He probably figured there is no way anyone would send in more troops, which would then give him the chance to campaign with "Well I told them we needed more troops and nobody listened to me!" Now that Bush actually is in favour of this, when it fails, and undoubtedly it will because the troop #s he's talking about are going to do nothing at all, then every single anti-McCain ad will be pointing out loudly how this was all his idea. And the public hates it as it is and will only grow to hate it even more.