Add campaign copy and fix missing surrogates module at the package level

obsidian/__init__.py

@@ -14,3 +14,4 @@
 import obsidian.exceptions as exceptions
 import obsidian.acquisition as acquisition
 import obsidian.plotting as plotting
+import obsidian.surrogates as surrogates

obsidian/campaign/campaign.py

@@ -464,3 +464,14 @@ def load_state(cls,
                 new_campaign.constrain_outputs(const)
 
         return new_campaign
+
+    def copy(self):
+        """
+        Creates a deep copy of the Campaign object.
+
+        A shortcut for saving and then loading the state. The presence of the torch objects prevents a direct deepcopy.
+
+        Returns:
+            Campaign: A deep copy of the Campaign object.
+        """
+        return self.__class__.load_state(self.save_state())