Is there a cutoff point for new candidates?

[Third Party]

I've read Oprah, Michelle and others coming up at the last minute. Is there a cutoff point for new candidates?

Yes, November 2020

Does that mean Hillary still has time to lose again?

I think she is the main contender for the victory.

In liberal fantasy land she would be.

She is not that liberal-she was a Goldwater girl once upon a time.