It's totally wrong and improper for her to publicize her endorsement for President, regardless of who she supports. One should keep his or her vote private. I have shared my vote only here on MERB, where I am anonymous, and speaking to a mostly Canadian audience. Taylor Swift, who is a calculating, egotistical person, know her endorsement carries weight and will influence people, and that she is a "Sheperd" whose flock of sheep will follow whatever she does. It is NOT FOR HER TO DECIDE THE ELECTION OR BELIEVE SHE CAN DO SO. She should stick to writing and performing her music, most of which I do not like.
What we are seeing here is a massive ego at work, a real prima donna. She is the very definition of a prima donna.
She is also pissing off a certain number of Republicans, which is plan stupid. A musician's legitimate goal is to have their music be the music of the people and to see as many records as she can, to as many people as they can. She probably doesn't need any more money than she already has, unless she wants to give it away. But by not keeping her political opinions to herself, which she ought to be doing (rather than behaving like an egotistical social influencer), she is causing a loss of profits, both for her and her agents. Who probably do not appreicate her very entitled prima donna behavior.