As example, take the House Bank scandal. While it was more than 3:1 Dems to Repubs, many of the Dems involved are still in office. Not a single Republican that I am aware of made it through the primaries. Conservatives generally know they will be held accountable, even by - or especially by - their allies.
Are you telling me a prominent Democrat could do crack cocain and still get elected? Come on, that could never happen.