Adding another wild-card to the 2012 campaign’s final days, a former aide to Vice President Joe Biden has written a tell-all Washington memoir in which he lacerates the former Delaware senator as an “egomaniacal autocrat” who was “determined to manage his staff through fear.”

The book is hardly an objective study of the vice president, however. Author Jeff Connaughton, a Biden Senate staffer turned lobbyist, is by his own admission deeply disillusioned with the capital and embittered about his experience with the man who inspired him to enter politics.

Connaughton wrote “The Payoff,” which came out last month, in the fashion of guilt-racked whistle-blower: he was a party to a corrupt system and now wants to blow the lid off the game.

“I came to D.C. a Democrat and left a plutocrat,” he confesses.

As chief of staff to former Sen. Ted Kaufman (D-Del.), Biden’s successor, Connaughton was radicalized by his unsuccessful experience trying to get an amendment to the Dodd-Frank financial regulation bill that would have broken up the country’s largest banks. So he left Washington politics and wrote what he believes is the unvarnished truth about the country’s political system. The big reveal: Big banks control both parties.

“It’s time people understand why – and how – Wall Street always wins,” Connaughton writes at the outset of his book.