What political party is The Observer?

Could you please clarify the context of the question? The Observer is a newspaper, not a political party. It's a daily newspaper in the United Kingdom that covers a wide range of topics including politics, business, and culture. While it may have a particular political leaning or take a stance on certain issues, it is not affiliated with any political party. If you are asking about the political affiliations of the journalists or editors who work for The Observer, that would be a different question and may require more specific research.