Huh? Of the 3 Republicans you mentioned, there was one alleged gay and two men with women on the side. These are your examples of closted gays and "diaper wearers" in the Republican Party? Mark Sanford resigned. Larry Craig actually resigned, but took it back.
I'm surprised you didn't mention Mark Foley, but then, he did resign, so I guess that wouldn't fit with your theme.
Spitzer resigned, true. He had lots of powerful enemies on Wall Street, he was seriously weakened by "Troopergate" and was under investigation for financial misdeeds surrounding the prostitutes (bribery, misuse of campaign funds) he was procuring that it's hardly surprising that he had to go. Note that Patterson suffered not a bit when he admitted to infidelity.
It's pretty surprising, actually, that Clinton survived. He was caught in a clear case of harassment, it doesn't matter a whit if it's consensual, the difference in power between a President and an Intern would have been harassment in a reasonable world. There was also that little matter of lying in open court. Martha Stewart goes to Prison for lying to an investigator and Clinton skates on lying in open court?
What other Democrat had to resign? Are you saying the Democrats are pure on this account and Spitzer and Clinton are the only examples?
I agree that the media applies different standards to Democrats when it comes to scandal. Like the blackout on the stories about Gore that have been known to reporters for years and are just now coming out.