It's the 6th single from an album owned by over 5 million people and individually owned by another 500k+. It's actually doing fine for a 6th single and I expect radio to suck this up again, just cause it's by Taylor, which might help the song peak inside the Top 20 or even Top 15.
I don't expect sales to pick up big time, so she'll end up barely scratching platinum with it.
Nonetheless, the best song on the record
