Quote Originally Posted by Flying Pig
Is it even possible? I mean, to win the short campaign you have to have selected the short campaign box, so it ignores the long victory conditions, no?
If you continue after winning or losing a short victory, you can then win a long victory by holding 50 provinces including Rome. And short or long, if you continue until you've conquered everything, you get the total domination message.

There's no way to know without testing whether short victory turns off the long victory conditions or whether it just turns on the short victory conditions - unless you go out of your way, you probably won't win a long victory without either winning or losing the short campaign. It is quite plain that you cannot win a short victory in a long campaign, since you will usually plow through your short campaign objectives on the way to 50 provinces and ruling Rome.