Minting Bank Lobbyists on Capitol HillApril 13, 2010, 7:27 pm Representative Barney Frank publicly rebuked a former aide this month for taking a job with a big Wall Street firm right after drafting a regulation that could affect the way the firm did business. Mr. Frank described it as an unusual transgression, one that embarrassed others working on the legislation and created at least the appearance of a conflict of interest. **SNIP** The case of Peter S. Roberson, whose hiring by a derivatives clearinghouse drew the ire of Mr. Frank, is the most extreme, and it points up holes in...