If former disgraced New York Governor Eliot Spitzer decides to run for state comptroller he may have some unusual competition.

Kristin Davis, a self proclaimed ex-madam who claims Spitzer was a frequent client, vowed Monday to run against him if he chooses to make a bid for the state position. Davis served time behind bars for her part in running a high-priced Manhattan call girl service and said she would push to legalize prostitution.

"I will run firstly to highlight the inequities and sexism in our criminal justice system which penalizes women, minorities and poor people while wealthy, connected white men like Eliot Spitzer evade justice," Davis wrote on her blog.

Davis penned a tell-all book in which she stated Spitzer was a frequent customer and was "good for a call at least once a week" from 2004 to 2006. She has also threatened to disclose other names in the book, which she said includes politicians, business leaders and pro-athletes.

According to reports that surfaced last week, Spitzer is mulling over an idea to run for State Comptroller. Gov. David Paterson has reportedly backed the move.

Spitzer resigned as New York governor in March 2008 when his involvement in a high-priced prostitution ring was uncovered. He is currently teaching a "Law and Public Policy" course at City College and writing a online column.