Back in October 2002, Representatives Jim McDermott (D-WA), David Bonior (D-MI) and Mike Thompson (D-CA) - all, of course, Democrats - took a trip to Iraq:

The three anti-war Democrats made the trip in October 2002, while the Bush administration was trying to persuade Congress to authorize military action against Iraq. While traveling, they called for a diplomatic solution.

Prosecutors say that trip was arranged by Muthanna Al-Hanooti, a Michigan charity official, who was charged Wednesday with setting up the junket at the behest of Saddam's regime. Iraqi intelligence officials allegedly paid for the trip through an intermediary and rewarded Al-Hanooti with 2 million barrels of Iraqi oil.

Back in 2003, I linked to "Saddam's Cash" (link), which mentions that trip and might have some bearing on the current case.