New York City Mayor Michael Bloomberg will co-host a fundraiser for the four GOP senators who voted in favor of a gay marriage bill, The New York Times reported.

Thursday's Manhattan fundraiser will benefit Republican Senators Stephen Saland of Poughkeepsie, James Alesi of Rochester, Roy McDonald of Saratoga and Mark Grisanti of Buffalo.

Tickets run as high as $16,800, the election law's current maximum donation to a campaign. ($10,300 for the campaign, plus a $6,500 contribution for potential primary challenges.) The fundraiser is expected to raise $1.25 million, a windfall by Albany standards. Bloomberg has already donated the maximum allowed to the four senators.

The event is 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.” The invitation also lists representatives from Marriage Equality New York (MENY), the Gill Action Fund and the Human Rights Campaign (HRC), the nation's largest gay rights group.

Christopher Plante, the northeast regional coordinator for the National Organization for Marriage (NOM), which is spearheading a campaign to oust the pro-gay marriage senators, told the Times: “We're not the last bit surprised about the money trail. But what we have are the people and voters of New York, who expect more out of their politicians, and we expect that they will stand up. The people of New York will not forget what these senators did.”