Since 2005, CREW (Citizens for Responsibility and Ethics in Washington) has put together a report on the Most Corrupt Members of Congress every year. It's a crowded field, what with Rangel up on ethic charges and Vitter and his diapers, but one name did rise to the top:

Roy Blunt is a candidate in the Republican primary for the United States Senate in Missouri. For the last 14 years, Rep. Blunt has served in the U.S. House of Representatives in the state’s 7th congressional district. As a member of Congress, Rep. Blunt came under fire for a variety of issues including employing the same corrupt tactics that forced his mentor, former Texas Rep. Tom DeLay, to resign. Rep. Blunt’s ethical issues were documented in CREW’s 2006 report on the most corrupt members of Congress.

In 2003, Rep. Blunt divorced his wife of 31 years to marry Philip Morris (now Altria) lobbyist Abigail Perlman. Before it was known publicly that Rep. Blunt and Ms. Perlman were dating – and only hours after Rep. Blunt assumed the role of Majority Whip – he tried to secretly insert a provision into Homeland Security legislation that would have benefitted Philip Morris, at the expense of competitors. Notably, Philip Morris/Altria and its subsidiaries contributed at least $217,000 to campaign committees connected to Rep. Blunt from 1996 to 2006.

Also in 2003, Rep. Blunt helped his son, Andrew Blunt, by inserting a provision into the $79 billion emergency appropriation for the war in Iraq to benefit U.S. shippers like United Parcel Service, Inc. and FedEx Corp. Andrew Blunt lobbied on behalf of UPS in Missouri, and UPS and FedEx contributed at least $58,000 to Rep. Blunt from 2001 to 2006.

Family connections have also helped another of Rep. Blunt’s sons, former Missouri Governor Matt Blunt. Gov. Blunt received campaign contributions from nearly three dozen influential Missouri lobbyists and lawyers when he ran for governor of Missouri in 2004, half of whom had provided financial support to his father. Earlier in 2000, when Matt Blunt was running for Secretary of State, Rep. Blunt was involved in an apparent scheme, along with Rep. DeLay, to funnel money through a local party committee into Matt Blunt’s campaign committee.Rep. Blunt and his staff had close connections to convicted former lobbyist Jack Abramoff. In June 2003, Mr. Abramoff persuaded then-Majority Leader DeLay to organize a letter, co-signed by then-Speaker Dennis Hastert, then-Whip Blunt, and then-Deputy Whip Eric Cantor, which endorsed a view of gambling law benefitting Mr. Abramoff’s client, the Louisiana Coushatta, by blocking gambling competition by another tribe. Mr. Abramoff had donated $8,500 to Rep. Blunt’s leadership PAC, Rely on Your Beliefs.