This week on Q&A, Harvard Law professor Lawrence Lessig discussed his latest book about money and its influence on Congress. Lessig is the director of the Edmond J. Safra Foundation Center for Ethics at Harvard University. In his book, he argues that large amounts of money, fueled by recent changes in campaign finance rules, can secure legislative influence in the United States government. He assails powerful business interests which sponsor corporate lobbyists to buy results in Congress. He suggests widespread citizen mobilization and a new Constitutional Convention will allow people to regain control of what he terms, "the corrupted but redeemable representational system." Lessig also speaks of the lessons gained from clerking for Justice Antonin Scalia at the Supreme Court, and Judge Richard Posner on the 7th Circuit Court. He offers his views on the Obama administration's accomplishments, and shares the influence his father had upon him while growing up in central Pennsylvania.