Yes, in the South (and the North, but that's already OTL).
I think if Gore endorses a centrist candidate then a centrist would win, and a Ralph Nader type emerges and gets a good chunk of the Progressive vote (I think that the Democrats would choose some issues to be progressive on, and many neo-con types might even join the Democrats). I do think that the Republican party may hasten itself as the nationalistic party, as if the Democrats become the internationalist, free trade, centrist party that Bush desired the GOP to become (and Clinton the Democratic), many union workers would bolt to the GOP. Also, for the Latino vote, Democrats may decide to be specially progressive (also for the progressive vote) on illegal immigration. Democrats would be the party of centrism (with a sizable centre-left wing), the Green party be a bit larger than OTL (Maybe one to two Senators at most, they aren't gonna be Bull Moose scale), and the Republicans the party of right-wing nationalism (Trumpian if you will).