You can be, say The Labour Party, and discard something for being socialist. But when your party is called "Partido Socialista", i wonder how you do it?
Its works for Murdoch's Fox News in the US, which is "Fair and BalancedTM". I've been accused of being a Marxist, yet while Harpo's my favourite, it's Groucho I'm always quoting. Odd, that.