>>3340826They can but it's a little different. Their opinions a lot of times are formed based on popular thought rather than logical reasoning. All this means is you have to become the most popular person in her mind and widdle away at her preconceptions until she thinks she's the one changing your mind on it.
You can't come out and say X is Y and here are all of the objective reasons why it is so.
You can however, become a fantastic boyfriend, dick her into a coma and gradually insert doubt into her ideas with little questions that you provide no answer for.
So instead of coming out as pro gun, ask genuinely what regulation would have prevented a shooting etc.
In reality she probably doesn't care about politics so your thoughts on it will suffice if she thinks enough of you.