Guys, Spy allows acting political, and so does Ringleader, but that doesn't make them political in the sense Dominion avoids being political. Obviously you can play political in any game. "Hey, why did you buy the last Village instead of the last Oracle, you know Catie is in the lead and she wants that Oracle, damned now she'll win because of you!"
The point is that neither card forces a political decision on you: You can, and will, still give each other player what you think harms him most. It's not like Ringleader said "pick one opponent". You always can pick any of them. Yes, your Jester can give out Golds, but you never have to decide between harming John or Francois, you have to decide between harming or not harming each. And: Dominion gives you no reason at all to not harm. You may get a choice, but that choice is to make sure you don't help unintendedly.