Common saying: We need a viable option in the form of a third party.
I used to tag onto this, not thinking too far beyond the figuratively incestuous nature of our current bicameral system then I attempted some shitty math. For example:
It takes a majority to win
36 / 33 / 31
What ends up is that the two "losers" actually hold the majority and within the vein of "the enemy of my enemy is my friend," which is wont to happen. The winner is more or less screwed.
It is logical the winner would attempt to engender some sense of partnership with one of the two losing parties