How easy they forget the ones with te R next to their names that have had to fall on their swords before a trial and yet how many Dems have stayed in office long after their crimes have been committed? I'm betting the list of Republicans is longer then the criminal Democrats. In case there's any doubt here are some more D names.
Marion Barry- Caught tried and convicted and still got elected to another office
William Jefferson - I know he was mentioned but he is still in office
Jim McDermont - Had to pay money after being sued by a fellow Senator
Robert Torricelli - Campain finance scandal
Frank Lautenberg - Lautenberg unexpectedly returned to politics in 2002, when the other New Jersey senator, Democrat Robert Torricelli, withdrew his candidacy for reelection, because of corruption charges. It was rumored, however, that Lautenberg was the second choice to run, the first choice being former Senator Bill Bradley, who turned it down.
The selection of Lautenberg came with some irony, as there had been notoriously bad blood between Lautenberg and Torricelli when the two had served together in the Senate.[2]
The New Jersey Republican Party challenged the replacement of Torricelli's name on the ballot with Lautenberg's, arguing that it came too late according to state election laws. The ballot name change was unanimously upheld by the New Jersey Supreme Court[3], and the U.S. Supreme Court declined to take up the case. Lautenberg won the election, defeating his Republican challenger, businessman Doug Forrester, by 54% to 44%. That victory made Lautenberg one of very few who in recent times returned to the Senate after leaving it.
Jack Murtha - Already mentioned but his les about US Marines
and a pending lawsuit should be enough of an embarrasment that the Democratic party should have been calling for his head. Its apparently not that big of a deal yet the Dems say they support our troops,

Diane Finestien - Has managed to get Government contracts given to her husbands company while a member of the Senate that are highly questionable as to hos his bids won
Harry Reid - managed to get into some shady real estate deals in Nevada and has yet to be investigated.