A new web ad has pro-gay marriage New York GOP Senators Roy McDonald, Mark Grisanti, Stephen Saland and James Alesi dancing for cash.

The ad released Friday by the National Organization for Marriage (NOM) is a response to a fundraiser held on Thursday by New York Mayor Michael Bloomberg. The fundraiser was expected to raise as much as $1.25 million, a windfall by Albany standards. Tickets ran as high as $16,800.

The event was co-chaired by Bloomberg, gay philanthropist Tim Gill and Elliot Management Corp. CEO Paul E. Singer. Singer has been described by The New York Times as “one of the most generous Republican donors in the country.” Bloomberg is the largest contributor to New York Republicans.

In the ad, titled Money Dance, the four GOP senators who helped pass a gay marriage law last summer dance with their wedding guests for cash. (View the ad here.)

“These four state senators have betrayed New Yorkers in their quest for wedding cash,” said NOM President Brian Brown in a statement. “They abandoned their stated values and their own promises to voters. We want to expose these senators and their same-sex marriage money dance. NOM and our Let the People Vote coalition will not rest until these legislators are turned out of office and the people of New York are allowed to vote on the definition of marriage.”

(Related: Gay marriage foes target New York lawmakers with billboards.)