Every time I watch a video by Colbert/Meyers/Oliver or Noah, I see about 5-10% downvotes.  Given the actual amount in question, that is quite a lot of people bothering to watch (nor not) a video they know they won't like, just so they can downvote it; as if Youtube votes were some kind of binding referendum.  But, yeah, I guess there are so many upvotes because of all the illegal immigrants who were bussed in to vote multiple times.