Pop megastar Taylor Swift officially announced her endorsement of Vice President Kamala Harris on Tuesday night in an Instagram post and encouraged her hundreds of millions of followers to register to vote. On Wednesday, NPR reported that Swift’s endorsement appears to have had an astonishing impact in the immediate hours following the post. In a separate Instagram Story (featured posts available through clicking the profile picture that are available for 24 hours), Swift included a link to the website vote.gov, which is a one-stop resource for voters looking for information about how to regis…