Democrats acknowledged on Tuesday that it may be impossible to match the nearly $900 million that the conservative billionaire Koch brothers said their political network will spend during the 2016 campaign cycle.

The eye-popping figure emerged on Monday as donors met at a Koch-organized winter retreat near Palm Springs, California. It underscored Charles and David Koch's commitment to push for smaller-government policies via a web of advocacy organizations.

"It's a staggering amount of money, and it's probably just the beginning," said Democratic strategist Bill Burton. "The truth is Democrats will never match what Republicans can put into these races."