This in the New York Times:
Two dozen high-profile New York business leaders plan to release an open letter on Friday urging state lawmakers to legalize same-sex marriage, arguing that the measure would help companies attract and retain employees.
We've already responded to this meme when it popped up in Rhode Island, Indiana, and --most recently-- Minnesota.
No matter which state the argument is floated in: the evidence simply does not show that redefining marriage helps state economies. In fact, the most prospering states have one-man, one-woman marriage amendments, and none have gay marriage, as Maggie points out in this column on the subject back in March.