First off, I am a heavy user of Stack Overflow and find it's focus on questions with clear answers good (although at times I wish it allowed "what is the best..." questions). But for a site on politics to not allow questions where the answers tend to be opinions, well a ton of politics is opinion.
I asked What is the best way to eliminate the corruption that comes with fundraising? which I think is one of the most interesting questions we have in politics today. And there is a lot of value in people laying out what is known on this issue. But the bottom line is there is no specific factual answer because nothing that has been tried has worked. By definition any answer is opinion.
I'm thinking this site is not for me. Because the most interesting questions in politics are the ones we don't have a clear answer to. The rest exists in Wikipedia.