You can’t deny that an anthem celebrating individual achievement matches way better with the American ethos than a song that can easily be sung by anyone. Not that I’m a fan of that ethos, but yeah the anthem is not out of character at all.
The anthem isn’t really treated like a “rally”, people stand with their hand over their heart and watch a skilled singer sing it.
It’s pretty much only sung at the beginning of professional sports games. Maybe government ceremonies, idk.
Obama won pretty hard though despite the racism, there were more people excited to see a black president than there were racists (although obviously there as a lot of vocal racism as well).
If Kamala tells a convincing story, I could see it working well.