I see three possible scenarios:
1. Packers plays their best, Bears play their best. Packers win b/c they are a better team.
2. Packers play mediocre, Bears play their best. Packers should still win but it will be close.
3. Packers play their worst, Bears play their best. Bears win.
So they way I look at it, we should win as long as we don't play horribly (I'm talking 18 penalties and giving up 2 TDs to Hester.