Man, a Senators list is terrific! I'm going to go in depth on this because all of the information is really interesting, hope you don't mind! I'm going to very rambling, and no mistake.
Alabama's senators seem pretty decent all things considered, really fascinating to learn about Heather Whitestone so thanks for that (Judging by the dates I assume she replaced Patterson when he passed! Alaska is a mixture of "Aw god" and "Huh!". Arizona and Arkansas makes sense, though I do have to wonder if there's much conflict between the Conservative party members given the OTL nature of their alignments. Condolezza Rice as a Progressive shook me but given that she was a Democrat up until the Reagan years I guess it makes sense. Not as much as her counterpart though, bloody hell! (In a good way) Colorado's pair of senators is terrific, love to see it. This is not a critique more of a statement but I would have figured Connecticut to be one of the bastions of Republican party members, but it's always good to see Progressive colours there. Castle is a no brainer but seeing Denn on the Republican side is certainly interesting. Florida gotta Florida, Georgia's a lot more interesting! Any particular reason why Reed has a different first name here? Hawaii's grand and no mistake, Otter makes sense for Idaho and I wonder what required a quick replacement for Idaho's other senator? Illinois having a Governor Madigan's fun, Indiana, Kansas, Missouri, New Hampshire, North Carolina, Oklahoma, Oregon, South Carolina, South Dakota, Vermont, Virginia, Washington, West Virginia, Wisconsin and Wyoming seem pretty understandable to me, interesting to see a young slate in Iowa though and Kentucky being a bit more competitive. Louisiana going full Conservative makes a lot of sense and Maine even now being a swingy state is pretty fair too, I know little about Cragin but it's fun to see someone different serving for so long!
Maryland's pair of senators sound pretty fun, all things considered! Same goes for Minnesota. It's fun seeing Republican Warren here, makes total sense! Curious about what happened with Michigan, though it's status as a swing state does make some sense. And man, I was preparing for the worse with Mississippi but that seems...pretty damn good all things considering! Once again, impressed to see that Montana, Nebraska and North Dakota is holding onto the Progressives even if there are troubles ahead for them. Same for Ohio, Senator Kucinich feels weird in a good way! Nevada being Conservative is interesting, definitely makes sense considering it's makeup even a decade or so back. Also Vincent Fox in Nevada! I love this kind of thing, really makes it interesting! Like learning about New Brunswick. New Columbia and Prince Edward Isle too, that's definitely sent me down a bit of a rabbit hole! SENATOR COLBERT (Oh and Christine Todd Whitman yeah but COLBERT). New Mexico's fun, New York's is interesting (A Conservative winning there in 2023 must have meant a BAD wave year for the Progressives). Nova Scotia being a bit of a swing state is also interesting, and also hell yeah Rogue from X-Men! I made an interesting sound at the reveal of Pennsylvania's new senator, holy shit! Is he meant to be the Governor of Colorado, because if so that takes carpetbagging to a whole extent! Pulling a Harold Stassen, eh? Rhode Island remaining a swing state makes a lot of sense still. Tennessee having a Progressive in office surprised me but it does make sense! And Texas too, hell yeah! Merrill Cook rarely gets a look in alternate history, fun to see him as one of the longer running senators.
Uh, tl:dr This list is awesome and thank you for making it!