WASHINGTON (Reuters) – A U.S. Securities and Exchange Commission lawyer warned about irregularities at Bernard Madoff's financial management firm as far back as 2004, The Washington Post reported on Thursday, citing agency documents and sources familiar with the investigation. Genevievette Walker-Lightfoot, a lawyer in the SEC's Office of Compliance Inspections and Examinations, sent emails to a supervisor saying information provided by Madoff during her review didn't add up and suggesting a set of questions to ask his firm, the report said. (snip) The newspaper said the SEC staffer raised concerns about Madoff but, at the time, the SEC was under...