When the same talking points are repeated over and over again on large subs and dissident opinions are automatically downvoted to hell, it's obvious there are organized efforts to push specific narratives or point of view. r/politics, r/news, r/worldnews are full of these, with sometimes the moderation itself in bed with the political astro-turfers, banning users that don't fall in line.
Regarding the article, the news that was astro-turfed wasn't clashing with r/politics narrative. And since journalists and bloggers themselves now source their news and stories from Reddit, it helped spread that news all over the internet.
Reddit is an extremely efficient viral marketing tool, both brands and politicians understand it now. When journalists start quoting reddit in their news that then get posed on reddit as news, we've come full circle.