IIRC, Perot dropped out and then reentered the race in 1992. That didn’t help him. He was ahead until then. Support got a tad shaky.
Then, he reportedly saw aliens on his lawn. Not the illegal border-jumper kind but the Alpha Centauri kind. That didn’t help him. Support got even more shaky.
Then, his selection of Admiral Stockdale didn’t help. Many thought Stockdale mentally incapacitated.