On the national level, one-time Democratic vice-presidential nominee and two-time presidential candidate, John Edwards finally confessed to having

an affair with a campaign worker (the National Enquirer first broke the story almost a year ago). I have to say that I never really liked him and found him very slick and phony. I vividly recall a conversation I had in Thailand with a fellow American tourist. She was an Edwards supporter and found him so genuine which I couldn't believe because he's always exuded slickness and sliminess
to me. He actually reminds me of Bill Clinton, whom I didn't vote for in the 1992 primaries because I could sense his sleaziness, too. (I voted for Paul Tsongas)
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On the local level, Cuyahoga County Commissioner and County Democratic Party Chair Jimmy Dimora and Cuyahoga County Auditor Frank Russo were raided by the IRS and FBI. I met them both on several occasions while volunteering for local elections in 1990, 1992, 1997, and 2006. I always found them to be slimy, too, and was not surprised in the least. Incidentally, the raid (and it's potential implications for the November presidential election made the
NY Times).

They now join an increasingly long list of local and national politicians who are crooks, sleazy, and/or slimy. In recent memory:
Marion Barry, DC Mayor (D)
Bill Clinton, US President (D)
Gary Condit, CA Congressman (D)
Larry Craig, ID Senator (R)
Randall "Duke" Cunningham, CA Congressman (R)
Marc Dann, OH Attorney General (D)
Tom DeLay, TX Congressman (R)
Mark Foley, CA Congressman (R)

Newt Gingrich, GA Congressman (R)
Rudy Guliani, NY Mayor (R)
Gary Hart, CO Senator (D)
Henry Hyde, IL Congressman (R)
Jessie Jackson, IL (D)
William Jefferson, LA Congressman (D)
John F. Kennedy, US President (D)
Kwame Kilpatrick, Detroit Mayor (D)
Steve LaTourette, OH Congressman (R)

Bob Livingston, LA Congressman (R)
John McCain, AZ Senator (R)
Jim McGreevey, NJ Governor (D)
Gavin Newsom, SF Mayor (D)
Bob Ney, OH Congressman (R)
Richard Nixon, US President (R)
Bob Packwood, OR Senator (R)
Dan Rostenkowski, IL Congressman (D)
Jack Ryan, IL (R)
Eliot Spitzer, NY Governor (D)
Jerry Springer, Cincinnati Mayor (D)
Ted Stevens, AK Senator (R)
Strom Thurmond, SC Senator (R)

Jim Trafficant, OH/Mars Congressman (D)
Antonio Villaraigosa, LA Mayor (D)
David Vitter, LA Congressman (R)
The whole episode with Edwards raised many questions, among them: should the personal lives of candidates matter and was the mainstream media right to ignore the story for 10 months while the Enquirer and blogs discussed it?
I am an admirer of JFK (and FDR and Thomas Jefferson for that matter) and while I never liked Bill Clinton personally, I am happy with the way things went during his presidency (budget surpluses, relative peace, strong international relations, etc.) and am glad he was president instead of George H. W. Bush or Bob Dole.
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On the other hand, if the sexual indiscretions are illegal (Spitzer, Vitter) or show him to be hypocritical (Craig, Foley) then I think they are more germane.
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In Edwards' case he was certainly hypocritical because of how forcefully he criticized Clinton and how he said a politician's personal life tells you about the candidate, and how put his family and values at the center of his campaign. Also, if he didn't break any laws he certainly did a lot of shady things like putting his mistress on the campaign roles with a plum job and later having her whisked off to a million dollar California estate with a huge stipend to live quietly.
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NPR's Talk of the Nation
aired a program on the dilemma of whether to report or not and NPR's political editor, Ken Rudin
wrote a column about it.