Many South Carolinians were outraged by the party’s decision to forgo a primary election and former Governor Strom Thurmond entered the race as a write-in candidate.
https://en.wikipedia.org/wiki/United_States_Senate_election_in_South_Carolina,_1954
The larger point is that in a high stakes election ( in this case a senate seat) , A write in campaign
can succeed in the context of a ‘non’ or ‘unjust’ primary.
Do most states allow write ins now? I don’t think my state does.
Yes, in the south in the 50s. There was no Republican party; Thurmond, the sitting senator, just had to beat a democrat challenger. It can happen sometimes in a state, especially south carolina in 1954. It can’t happen in a national presidential election. You won’t even get one state as a write in. Might be able to get some states as a third party candidate on the ballot, but the 3 way split favors the major parties. Best to organize and put the RNC out of business first.