Head cannon: The Kennedy party is the "Third way wing" of the Democratic party cranked up to 11. It's dommaint in the coastal regions and the industrial regions in the midwest and south. Thus any opposition parties are regional and confined to areas that have been historically been economically underdeveloped.
Kinda, they're a mix of OTL third way Dems cranked up to 11 and some Republican factions when it comes to ideology
They're kinda dominant everywhere just due to hegemonic everything, they gained power off of dissatisfaction with the Republicans and kinda just stuck around ever since then. Opposition parties just win votes wherever the individual opposition party is the strongest, in the case of the Democracy USA Party that's the northeast, northwest, and midwest, because people in those areas are still more economically leftist than the rest of the country as IOTL. The Liberal Reform America Party won Pennsylvania because they're neo-georgist, and georgism has historically had ties to Pennsylvania. The Restore America Party is prevalent in the plains and south because they're
super right-wing
Also the ASDP isn't so much the "Kennedy Party" as it is the Tammany Hall Party. The Kennedies are the most prominent family in it by far though, with Joseph Kennedy's ideology still being a major part of its platform. Although individual party members debate the true meaning of it all the time, about as much as OTL Americans debate which of their ideologies is closest to that of the founding fathers
Also am I the. only to notice that Florida has 47 electoral votes?
Nah, some people have pointed it out on the thread for my TL as well. I basically made it so Florida received the population boom instead of California for yet undetermined reasons