Google guessed that you would be interested in those articles based on your search behavior, that's their entire business model. There is no conspiracy to push Google's politics on you because it would undermine their perceived impartiality. They're everyone's search engine, not just Democrats.
This isn't the only example. The one I saw was Google pushing a special section on immigration to my main Youtube front page and, as far as I can tell, to everyone else's too a few weeks ago right after Trump's ban. It had completely different formatting from anything I've seen in the feed before or since, and seemed to contain identical videos for everyone. Youtube does not normally recommend political videos of any kind to me.
