I don't think this necessarily means anything changes, but I have no idea why this is going on:

https://www.usatoday.com/story/opinion/voices/2022/12/09/sen-kyrsten-sinema-of-arizona-why-im-registering-as-an-independent/10864551002/

The two "independent" Senators we already have basically just vote along Democrat lines anyways, so Sinema changing her party affiliation in itself is probably meaningless. But I am wondering if there is some weird behind the scenes action going on, as the political theater itself is never the true story anyways.