First, we look at news aggregators and twitter trends to see what the big stories of the day might be.
Then we pull a bunch of tweets with our social media listening tool and try evaluate the story on three criteria: Momentum (is it trending and growing), Partisanship (are two sides talking about it), and Emotion (Is the story morally animating).
Then we collect data by pulling tweets through our tool, and focusing on the most widely shared and engaged tweets, and sort them into pro/con (or whatever division fits the story.
Then it's analysis. We identify the facts each side is referencing, the affected values and emotions from either side, and whatever the key source of division is (if there is one.
Like any methodology, this has its limitations. It only looks at twitter, for example. If there is an argument or position out there that doesn't come through in the data, then we can't really assume it's there (although we do use broader ideas to contextualize and explain the data).
And although a fraction of the country uses twitter, we think it has a much larger influence. Twitter is like a narrative breeding ground, and those narratives are then picked up by journalists, which are then propagated in mainstream media and broadcast to people who aren't on twitter.
That's at least our thinking. We should probably be more explicit about what our methodology is (and why)
Like some Europeans enthusiastically welcoming Ukranian refugees although they were hostile towards Middle Eastern refugees. So they rationalize by saying these are women and children, and the M.E. refugees were men who should've stayed and faced (fought) their government's bullets.
IMO the Republican's reasons for a lot of things is just to retain power. Things like voter disenfrachisement, or opposing anything the Dems wants, because if the Dems get things pushed through, and people like it, it will make them (GOP) look bad.
Will you start writing "The reason this side opposes this is because they want to sabotage it for the other side and make them look bad, who cares about the public who's getting screwed"? You won't be seeing this on Twitter...