Seems like #2 would have the opposite effect by prioritizing the author's political leanings rather than the issues.
Facts aren't actually Democratic or Republican, and there's not a single consensus opinion for each party. But slap a party or ideological label on an article and it will appear to indicate the article is aligned with that bias label (even if it isn't). And people will conflate the contents of the article with the appropriate side even more than they already do.
What might be more successful would be to include a neutral fact check-style notice like "This article presents the majority Republican opinion on ___" or "This article uses widely-disputed claims to justify a fringe Democratic position". That would provide more context to the actual content of the article and how to interpret it.
Facts aren't actually Democratic or Republican, and there's not a single consensus opinion for each party. But slap a party or ideological label on an article and it will appear to indicate the article is aligned with that bias label (even if it isn't). And people will conflate the contents of the article with the appropriate side even more than they already do.
What might be more successful would be to include a neutral fact check-style notice like "This article presents the majority Republican opinion on ___" or "This article uses widely-disputed claims to justify a fringe Democratic position". That would provide more context to the actual content of the article and how to interpret it.