The four Republican Senators were told, time and time again before casting their votes that betraying marriage has consequences.
The New York Times with yet another example of this fact:
Senator James S. Alesi, one of four New York State Republicans who voted in favor of same-sex marriage last year, is unlikely to receive the nomination of the main Republican committee in his district, setting the stage for a difficult re-election race that could have implications in the fight for control of the State Senate.
Two Republicans in Monroe County, where a majority of Mr. Alesi’s district sits, said that Mr. Alesi, an eight-term senator, had no support from local party leaders, in large part because of a lawsuit that he filed last year against two of his constituents and that many considered frivolous. The Republicans, who requested anonymity to discuss a developing process, said that Mr. Alesi’s support of same-sex marriage also was a factor, but that it was not decisive.
... Other Republicans who favored same-sex marriage have seen some consequences.
The Republican committee in Wilton, the hometown of Senator Roy J. McDonald, endorsed a potential opponent. The Erie County Conservative Party endorsed a Democrat to challenge Senator Mark J. Grisanti. But, unlike the others, Mr. Alesi’s marriage vote is not his greatest problem.