One of the many Obama scandals that never took off was the fact that he received millions in highly questionable campaign contributions through such means as disabling address verification. As I first reported, he also accepted gift cards; those can be bought with cash and thus could have been used to funnel nearly-untraceable money to his campaign.
In addition to that, he also accepted large amounts of money from employees of various corporations, including Exelon. And, his former bagman Tony Rezko had given him money in the past.
He even accepted - but later returned - small donations from his illegal alien aunt, the one who he later threw under the bus.