Hmm.... I'd say an actual third party is closer to a third party. Not sure what you mean.
The parties will have some process for determining their nominee. And really, it's their business. The only election reform on the horizon that makes sense to me is ranked choice voting. Everything else is either too much to hope for, or not enough to matter.
I won't "take" a shitty candidate. Period. If the best our fucked up system can produce is candidates like Biden or Trump, we've already lost. The "privilege" of choose between them is worthless.
What I mean is that while there are third parties I like, such as socialists, green party, etc., they do not have any possible chance and are a waste of a vote
While as bad as Trump is, he is much better than what the democratic party in general represents.
Hillary is tainted by her support for every single war one could imagine, to the point I suspect she would have attacked Iran if elected.
Biden is tainted by his 1994 Federl Crime bill, the War on Drugs, mandated sentences, asset forfeiture, Ukraine corruption, etc.
About the only democrats I would vote for are Sander, Warren, or Gabbard.
They rest are as bad or worse than Trump.
Anyone who votes based on party is really irresponsible.
And NO, the parties do NOT have any right to determine who runs.
That prevents anyone who might have bi-partisan appeal from even getting nominated, even though they would most likely be elected and be better representatives of the people.
Parties are NOT legal entities.
They should NOT exist or at least should not have any official role, like they illegally do now with primaries.
We should not be allowing parties to hijack our voting system with their primary corruption.
Instead we should have an open election with all the candidates, who voters rank, so run offs from a tie can be eliminated.