As someone who is pretty active in the Swiftie community, it has a huge impact. We've already seen the fundraising impact, the registration impact, the volunteer impact- it's about as impactful as an endorsement could be in 2024 given her broad support. Obviously can't guarantee the impact will matter in the end, but I'm definitely willing to bet Kamala (at a minimum) gets tens of thousands more votes than she otherwise would have, which could be enough to flip a state or two given the margins here.