Why do you think Taylor Swift is seen as such a powerful figure to shape the election by both Democrats and Republicans?

I would argue that she is unlikely to shape the election and I don't think that most Democrats or Republicans believe that she has that much influence. That is not to say, however, that her endorsement would not have an impact; encouraging her fans to register and vote for a particular candidate could increase turnout and the balance of votes. Taylor Swift's international celebrity makes her unique compared to other endorsements from political figures or celebrities with less notoriety. Moreover, in the past Taylor Swift's endorsements or political comments have appeared to result in a surge in voter registrations, which is notable and different from other celebrity or political endorsements.