strange bedfellows

Two politicians are “strange bedfellows” if they have made an unusual political alliance.

The term comes from Shakespeare’s The Tempest when a storm causes Trinculo to seek shelter under a sheet with Caliban, whom he regards as an enemy. “There is no other shelter hereabout: misery acquaints a man with strange bedfellows. I will here shroud till the dregs of the storm be past.”