Answer:
Depends.
Step-by-step explanation:
The VP is the VP of the president who is of a certain party. (So far presidents have only ran Republican or Democrat) Therefore, they would have a loyalty to the party that their running mate represents. However, depending on the matter being brought up and what they are voting on, the VP would vote on what they feel is best. (I am assuming. ) Most likely they would side with whatever party the President ran as, because their views would be similar.