One of Hillary Clintons' Democrats (Eliot Spitzer) Caught with his Pants down as he hired a hooker in new political sex scandel

WASHINGTON (CNN) -- New York Governor Eliot Spitzer, a key backer of Hillary Clinton and a rising Democrat star who rose to prominence rooting out corruption, was facing calls to resign Tuesday over allegations he paid thousands of dollars to a prostitute.

Spitzer immediately apologized to his family and the people of New York but did not elaborate on the scandal.

At a hastily convened news conference in Albany, the state capital, he confessed Monday to an undisclosed personal indiscretion, saying he had acted "in a way that violates my obligations to my family."

"I have disappointed and failed to live up to the standard I expected of myself," the 48-year-old father of three teenage girls said. "I must now dedicate some time to regain the trust of my family."

Once seen as a rising star within the Democratic party, Spitzer took office in January 2007 with a landslide victory after serving eight years as the state's attorney general. But the scandal raises questions about whether he will make it through a second year.

"I think there's no question if he is involved -- and I'm not saying he is, because we don't know all the facts -- I would say he'd have to resign," said James Tedisco, the Republican minority leader in the state Assembly.

Tedisco said Spitzer's push to reform government "loses all validity if he was involved in something illegal like that."

The Republican Governors Association called on Spitzer to resign to "allow the people of New York to pursue honest leadership."

"The American people are tired of corrupt and hypocritical politicians. The governor of New York is just another in the long list of politicians that have failed their constituents," said Nick Ayers, executive director of the Governors Association.

U.S. presidential candidate Hillary Clinton sidestepped questions about the sex scandal threatening her home state governor and political ally.

"I don't have any comment on that," she said when asked about the allegations. "Obviously, I am sending my best wishes and thoughts to the governor and to his family," Clinton said.

The allegations, revealed Monday in The New York Times, were outlined in federal court papers detailing a meeting in a Washington hotel room last month between a prostitute and a client who a source told CNN was Spitzer.

The affidavit does not mention Spitzer by name, but a source with knowledge of the case said the subject identified as Client-9 is the governor. He has not been charged.

His alleged involvement with the ring was caught on a federal wiretap, the source said.

The prostitute, identified only as "Kristen" worked for the Emperors Club, which charged between $1,000 and $5,500 an hour and operated in New York; Los Angeles, California; Miami, Florida; London, England; and Paris, France, according to court papers.

According to the affidavit, defendant Temeka Rachelle Lewis -- who is accused of working as a booking agent for the club -- wrote a text message Monday, February 11, asking the operation's day-to-day organizer to "pls let me know if (Client-9's) 'package' arrives 2mrw. Appt wd be on Wed." Prosecutors say the message was a reference to a deposit.

On Tuesday, according to the affidavit, Lewis sent a message to Kristen, saying Client-9's deposit had not arrived but she should be able to "do the trip" if it arrived the next day.

In a later conversation, Lewis and Kristen discussed when the prostitute could take a train from New York's Penn Station to Washington's Union Station, the affidavit says. Client-9 would be "paying for everything -- train tickets, cab fare from the hotel and back, mini bar or room service, travel time, and hotel."

The affidavit says that, about 5 p.m. Tuesday, February 12, Lewis spoke with Client-9 on the telephone and told him that his "package arrived today." The client asked Lewis whom he would be meeting and, when told it was Kristen, said, "Great, OK, wonderful."

The two discussed how the woman would get a key to his room for a Wednesday rendezvous and how they could arrange credit for future services.

"Client-9 asked Lewis to remind him what Kristen looked like and Lewis said that she was an American, petite, very pretty brunette, 5 feet 5 inches and 105 pounds," the affidavit reads.

In a call to Lewis, Client-9 was told the balance would be $2,712.41, but Lewis suggested he give Kristen $1,500 or $2,000 more so that he would have a credit.

According to the affidavit, Kristen called Lewis about 9:32 p.m. Wednesday, February 13, and told her she was in Client-9's room -- No. 871 -- at the Washington hotel.

Four minutes later, Client-9 was in the hotel, Lewis told Kristen in another call.

No more calls were logged until 12:02 a.m. Thursday -- Valentine's Day -- nearly 2½ hours later. At that time, Kristen told Lewis Client-9 had left and she had collected $4,300.

Lewis told the prostitute she'd been told that Client-9 "would ask you to do things that, like, you might not think are safe -- you know -- I mean that ... very basic things," the affidavit says.

Spitzer, who built his career on rooting out public corruption as New York attorney general, became a national figure with a series of high-profile Wall Street investigations. He is also known for prosecuting prostitution rings. Read Todd Benjamin's blog

People who know Spitzer, 48, were surprised by the allegations. "To say this is a shock is an understatement," said CNN senior legal analyst Jeffrey Toobin, who went to law school with Spitzer.