She commands a large following and they are afraid of her influence but I think those who do worry have nothing to worry about. She is a big music star not a politician so her ability to sway voters who are dead set on some political ideal wouldn't change that just because Swift said so.
‘Violently shaking’: Swift left stunned. Taylor Swift said she was “losing my mind” after witnessing an incredible scene midway through the opening concert of her Aussie tour. Source 6l.