I know it feels good to just breezily generalize, but I just looked through the 2 subreddits you named, and of the 125 top-voted links of the past 24 hours on /t/The_Donald, a whopping 4 of them are from Breitbart (a simply Ctrl+F on each page shows it). That subreddit is most memes, tweets, and even simple photos with smart-ass original titles written by the poster. Just do a word-find on "i.redd.it" and then "imgur.com" on each of the first few pages and see.
As for Shareblue on /r/Politics, there are no links from the Shareblue.com domain in the top 125 links today, but I assume you were referring to the source of the narratives; well, you would more effective in just point to actual sites: of the top 125 links on there for the past 24 hours, 16 are from WashingtonPost.com and 15 are from TheHill.com.
Edit - here: