What it says on the tin. Since some of the most successful third party performances for the presidency and in Congress have been regionally focused, could a lasting regional party develop? The closest OTL example I can think of would be the Farmer-Labor Party in Minnesota, but they were still absorbed by the Democrats.
One interesting possibility I can think of is a rump Progressive Party in California after 1912. Since Hiram Johnson was governor there and many Progressive senators and Representatives were from California, I could see it surviving for longer if it became inwardly focused.
One interesting possibility I can think of is a rump Progressive Party in California after 1912. Since Hiram Johnson was governor there and many Progressive senators and Representatives were from California, I could see it surviving for longer if it became inwardly focused.