We already knew that BP — the oil company whose destroyed rig is gushing oil into the Gulf of Mexico — has been in bed with Democrats for years now. Federal election records reveal that the company and its employees were major donors to the Obama presidential campaign. And the Obama Administration decided to give the oil giant a safety award not long before the ongoing oil spill began.

But now, according to the LA Times, there’s another layer of corruption. You may vaguely recall some controversy that arose in early 2009 regarding a revelation that, as a member of the House, Rahm Emanuel — Obama’s chief of staff — lived rent-free for five years in a D.C. apartment owned by Rosa DeLauro (D-CA) and her husband, Stanley Greenberg.

Yeah, about that…

Greenberg’s consulting firm was a prime architect of BP’s recent rebranding drive as a green petroleum company, down to green signs and the slogan “Beyond Petroleum.”

Greenberg’s company is also closely tied to a sister Democratic outfit — GCS, named for the last initials of Greenberg, James Carville, another Clinton advisor, and Bob Shrum, John Kerry’s 2004 campaign manager.

According to published reports, GCS received hundreds of thousands of dollars in political polling contracts in recent years from the Democratic Congressional Campaign Committee.

Probably just a crazy coincidence. But you’ll never guess who was the chairman of that Democratic Congressional Campaign Committee dispensing those huge polling contracts to his kindly rent-free landlord.

The DCCC chairman at the time was none other than Rahm Emanuel. So Greenberg, an adviser to BP, was allowing Emanuel to live rent-free in his D.C. apartment for years. In exchange, Emanuel funneled hundreds of thousands of dollars in polling contracts to GCS — another Greenberg firm.

Sounding corrupt? You bet. Will anything of substance be done about it? Unlikely.