The simplest idea is to simply have third parties actually win states. Bonus for multiple third parties
Here's a possible map with a centrist democrat winning a landslide while a far left candidate wins several states and a McMullin like candidate also wins states and the Libertarians also winning states:
Centre-left Democrat: 379 (39%)Donald Trump: 127 (31%)Libertarian candidate: 15 (14%)McMullin-like candidate: 10 (7%)
Far left candidate: 7 (9%)Then again such an sceario has essencially a 0% chance of happening, and even a single third party winning a state is extremely unlikely, that's just the craziest idea I could come up with while extrapolating from 2016
