Rudy pushed Kerik for head of DHS. Without apparently vetting him.
The Dems will use that to negate much of Rudy's advantage regarding the WOT. They can claim that Rudy was more interested in cronyism over competence in pushing Kerik for the most critical anti-terror job in the country.
Kerik was not charged with incompetence but porking a broad outside Holy wedlock.
And in any case it was not his job to vet him for the President. This was merely a minor embarassment which not even the Rudy hating media will be able to effectively use.