Unless he is demanding money, I don't see blackmail. He could just be interested in a more 'moral' NJ representative. If she originally posted them on the internet, where is the problem other than her potential embarassment? If the letter writer is associated with the runner-up, that might casr a different light on the matter, but still not a crime.
According to the article posted in #42 above, she published them on a "private website". That means they were not available to the public internet.
The difference between a private site and a public site is the same as the difference between inside your house and on the street in front of your house. Just because your house has a front door and a walkway to the street, it doesn't mean that all your private pics and papers in the house are "on the street".
It sounds to me like somebody gained access to her "private house" and copied the pics, and now threatens to post them "on the street". She has a right to be pissed off about that, because it's not fair.
Oh well, life's not fair.
She was stupid to publish the pics at all. But it's not accurate to say they were available for public view before this.