The NYTimes alert:

In a stunning reversal, the Democratic majority in the New York State Senate appeared to lose control of the chamber Monday afternoon when two senators broke party ranks to back a Republican motion to displace the Democrats as the party in control. The motion appeared to pass, 32-30, despite procedural moves to block it.

The NYTimes City Room blog fills in details of a raucous leadership fight that erupted on the floor of the state Senate around 3 p.m. after the two New York City Democrats, Pedro Espada Jr. of the Bronx and Hiram Monserrate of Queens, switched sides:

It was a noisy and acrimonious scene on the floor of the Senate as Senator Thomas W. Libous, a Republican from Binghamton and the party’s deputy leader, shouted for a roll-call vote, while Democrats attempted to stall the vote by asking to adjourn the session.

All 30 Republicans stood with their hands raised, signaling a vote for a change in leadership. Mr. Espada and Mr. Monserrate joined them, each raising his hand. Republicans won the vote by a 32-to-30 margin. The Senate will now be governed under a new joint leadership structure, with Mr. Espada serving as the president pro tempore, and Senator Dean G. Skelos, of Long Island, as the new majority leader.

Those two defecting Dems are not exactly choir boys:

Why Mr. Espada and Mr. Monserrate suddenly defected on Monday afternoon was not immediately clear. Both men are under investigation by the authorities. The state attorney general’s office is investigating a health care agency, Soundview HealthCare Network, that Mr. Espada ran until recently. And Mr. Monserrate, who was indicted on felony assault charges in March stemming from an attack on his companion, would automatically be thrown out of office if convicted.

Blame it on the gay agenda?

One source of contention among Democrats recently has been Mr. Smith’s support for same-sex marriage. Senator Rubén Díaz Sr., a Democrat from the Bronx, has been outspoken in his insistence that legislation allowing gay couples to marry not be allowed to come to a vote. Some had speculated he might leave the Democratic Party if Mr. Smith were to allow a vote.

But Mr. Díaz did not join Mr. Espada and Mr. Monserrate in the leadership vote on Monday. It was not immediately clear whether the same-sex marriage legislation played any role in the leadership dispute.

Probably not. Maybe this:

One person backing the revolt to put Republicans back in charge was Tom Golisano, the Rochester businessman and founder of Responsible New York, a political action committee that gave thousands of dollars to Senate Democrats last year to help them take control of the Senate, but who has become increasingly critical of the party. Mr. Golisano recently announced that he was moving his legal residence to Florida out of anger about the budget deal crafted in April by Democratic leaders in Albany, which included an increase in taxes on high earners.