David Weprin's support for gay marriage has NOM pouring money into Bob Turner's campaign as the men vie for Anthony D. Weiner's seat.

Democratic New York Assemblyman Weprin voted in favor of making New York the sixth state to legalize gay marriage. Groups opposed to the legislation vowed to work against the campaigns of lawmakers who supported its passage.

The National Organization for Marriage (NOM) on Wednesday said it would spend $75,000 to help elect Republican Bob Turner in the upcoming September 13 special election to replace former New York Rep. Weiner, who resigned in June as a result of a sexting scandal.

According to The New York Times, NOM has already spent $45,000 on the race, and plans to spend an additional $30,000.

“David Weprin made a terrible mistake when he voted for same-sex marriage,” NOM President Brian Brown told the paper, “and I think his community is going to hold him accountable.”

Also on Wednesday, Assemblyman Dov Hikind, an opponent of gay marriage and a Democrat, endorsed Turner.

At least one poll shows the candidates in a 42%-42% dead heat.

(Related: NOM targets pro-gay marriage GOP candidates in New York.)