On topic, if the original question is genuinely intended to start a discussion, great. However, things get squirrelly pretty fast if you have an agenda or even if you are perceived as having one.
I've started a few threads, and honestly, it's more trouble than it's worth to me anymore. Sometimes, they go pretty well and generate a lot of good discussion.
Lately, I've been really interested in polling on various things, where the topics are completely disassociated with a person or political party. And it's crazy how, if you sanitize the topic and remove it from a political context, folks will objectively come to different conclusions. For example, a few months back I took language from an actual website related to self defense. When folks didn't know where it came from, the comments were mixed, and the discussion was really healthy and constructive. AS soon as they found out where the language came from, folks retreated to their teams instantly.