Private equity firms could get roped into helping pay for U.S. tax reform. To help offset the budget cost of lower corporate rates, my industry sources tell me, Democrats in Congress are considering an attempt to alter the treatment of publicly traded partnerships. Such a move could bring in several billions of dollars a year from Blackstone, Fortress and Apollo, the latest buyout shop to move to the New York Stock Exchange. A similar legislative effort in 2007 failed, but this one might have legs.