Not that the companies are content to leave it there. Uber, Lyft and food delivery service DoorDash are threatening to take the fight to voters, putting a combined $90 million into a political committee to craft, qualify and promote a ballot measure that would seek to preserve the status quo for their business models. The result could be one of California's most expensive election showdowns ever — and could force labor unions to divert money from a high-profile ballot measure to exclude business properties from the low-tax protections of Proposition 13.