Democrats are preparing to put on a two day campaign finance floor show in the Senate, scheduling a handful of votes and a “midnight vigil” for increased disclosure of who, exactly, is donating to the outside groups underwriting both Barack Obama’s and — to a larger degree — Mitt Romney’s campaigns for president.

The bill has virtually no chance of passage – a fact of which its sponsors are keenly aware. But Democrats hope to use the legislation to point a finger at Republicans on the new flood of cash.

Led by Sens. Sheldon Whitehouse and Chuck Schumer, Democrats this evening will force a the first of two votes on the Disclose Act, legislation designed to force Super PACs to disclose large dollar donors.