It’s pretty much completely impossible for a third party candidate to ever win. You have to get 270 (just over half) of all the electoral votes. If any third party made a huge amount of headway it’d still be almost impossible to take enough votes from the repubs or democrats to hit 270, and anything less than 270 means the House gets to decide who becomes president. Obviously, the house filled with democrats and Republicans, would never select the third party candidate.
Correct. I’m pointing out the complete futility of anything other than that.