A Threads account seems somewhat more likely as there's already @potus and @barackobama, but it would be fantastic if the Harris campaign would set up a proper ActivityPub channel.
Stuff like this will probably become more likely once Threads start federating both ways, so that the user base of Threads is available for organizations promoting themselves on Mastodon. But I feel like $30 000 should at least make them consider copy/pasting content to Mastodon.
The idea is that if one is donating to the Harris campaign anyway, doing it under a shared Mastodon banner might push the Harris campaign towards posting on open platforms. So it serves a double purpose of fighting Trump and Musk at the same time.