At the end of the 2008 presidential campaign, the Obama-Biden effort was hit with a similar scandal. At the time, the Washington Post reported that the Obama campaign let donors use "largely untraceable prepaid credit cards that could potentially be used to evade limits on how much an individual is legally allowed to give or to mask a contributor's identity."
That was Miss Marple. But she left when the Anti-Romney wars really got heated earlier this year.