Conservatives hoping to prevent private money from helping Americans vote have so far taken direct aim at just a couple of billionaires: Facebook chief executive Mark Zuckerberg and his wife, Priscilla Chan, who on Tuesday announced another $100 million in donations to help local governments conduct comprehensive and safe balloting in three weeks.

The donation follows their previous gift of $300 million, which has prompted lawsuits from the right in eight battleground states arguing that such benevolence should not be permitted to cover election administration costs.

But the Facebook philanthropists are among hundreds of business leaders who have stepped forward to help cash-strapped election officials scrambling to put enough poll workers, protective gear and infrastructure in place to avert chaos on Election Day. From the four dozen stadiums that sports leagues have opened as polling sites to the millions worth of face shields, masks and safety supplies donated to election workers by major corporations — the private sector's investment in this election is without precedent.