And also how Kamala is trying to get us back to an era where it was possible for Republicans and Democrats to see eye-to-eye on core values and use that agreement to create good laws for the country. Dick Cheney is not the best vehicle for that particular idea, but in general that's one purpose of the Republicans For Harris stuff.
It's interesting to look back at 80s legislation that we take for granted now, and how it was put into law. Generic drugs became a big thing because of a bipartisan law known as Hatch-Waxman -- after arch conservative Utah Senator Hatch and Dem Henry Waxman. There was a lot of wrangling about it behind the scenes, because it's complicated and because there were many different industries who had adverse interests there -- but when it came up for a vote, according to wikipedia, they didn't even do a roll call. It was a voice vote. Imagine having a complicated bill today that would have so much support they wouldn't even need to count the votes.
We've talked about some of the factors that created today's polarization. Newt Gingrich gets a lot of blame in these stories. I can't really evaluate that. Gerrymandering also plays a big role, as does the Southern Strategy. During the 80s, most states had competitive Senate races, and party splits among a state's Senators were common. For instance, in the 1986 Senate races, Dems won CA, MO, LA,and NC, whereas Pubs won NY. In 1988, Pubs won CA and MO, whereas the Dems won NY (and Pubs would of course win NC in 1990).
Even as recently as the Obama administration, Pubs held seats in CO and PA, whereas Dems had seats in NE and IN. Now, few states have split Senate representation. I think it's only WI, MT, OH, WV and ME -- and WV is done for, MT looks untenable and OH maybe. Plus, Ron Johnson in WI is perpetually in danger of losing, so he might go down soon. It's entirely possible that by 2028, Susan Collins will be the only opposing-party Senator with any substantial popularity or longevity. I'm not counting GA because it's been about as close to pure purple as it gets. Also assuming MD voters don't become overcome by idiocy and vote Larry Hogan.
A lack of real competition produces polarization. Few Senate races are truly competitive these days, and the ones that are typically occur in battleground states where Rs and Ds are in roughly equal numbers. Ben Nelsons and Joe Manchins and Pat Toomeys are increasingly rare.