An anonymous $10 million check: But that campaign money is only part of the story. On Friday, the Washington Post reported that an anonymous donor gave the Karl Rove-backed Crossroad GPS a $10 million contribution late last year. Unlike American Crossroads, which is a Super PAC and which has to disclose its donors, Crossroads GPS is a 501c4 and doesn’t have to reveal the identity of its donors. So with one check, an anonymous donor gave this conservative outside group about half ($10 million) of what the Obama campaign raised in February ($21.3 million).