"Hoist by one's own Petard"

Yesterday in the news I read that NY Governor Eliot Spitzer hired $1000/hour prostitutes and was caught on an FBI wiretap at least 6 times. Mr. Spitzer is known for serving as attorney general with his relentless pursuit of Wall Street wrongdoing. As attorney general, he prosecuted at least two prostitution rings as head of the state’s organized crime task force. In one such case in 2004, Mr. Spitzer spoke with revulsion and anger after announcing the arrest of 16 people for operating a high-end prostitution ring out of Staten Island. Spitzer said then, “This was a sophisticated and lucrative operation with a multitiered management structure, it was, however, nothing more than a prostitution ring.” What's the phrase they have out there, "hoisted by his own petard"? Should Spitzer resign his position and be prosecuted for these crimes? Not only did he have an affair (wife, 3 kids), but also he broke the law that he swore to uphold (Soliciting a prostitute, illegally wiring money across state lines). The same laws he prosecuted others for breaking. A small twist in the story is that Gov Spitzer is a prominent Democrat and a Super Delegate for the Democrat Electoral Board who has pledged his votes for Hillary Clinton. No doubt there may be pressure from her campaign and friends to keep him around until the Democratic Convention with the election so close. Would that be ethical?