I watch a lot of YouTube, often without an ad blocker, and I see almost no political content on my home page. The only place I regular saw political content was in the in-video ads which appeared to be just normal paid ads purchased by the campaigns.
It depends on what country you live in. Youtube was throwing Navalny and his friends videos into my feed no matter the "don't recommend videos from this channel" button. It somewhat lowered the intensity, but they still tried to mix their political agenda into my feed.
