Democratic Governor John Lynch, the second governor to sign a gay marriage law, on Tuesday won an historic fourth consecutive term as New Hampshire's governor, the AP reported.

Lynch overcame an anti-incumbent, anti-Democrat sentiment to beat his Republican rival, John Stephen.

Stephen was supported by high-profile Republicans, including Mitt Romney, Tim Pawlenty and Haley Barbour.

The National Organization for Marriage (NOM), the nation's most vociferous opponent of gay marriage, also came to Stephen's aid.

The group criticized Lynch for raising taxes and signing last year's gay marriage law in a $425,000 television and radio campaign titled He's Changed.

The ad featured video footage of Lynch saying, “I do not support gay marriage.”

“Lynch signed gay marriage into law,” a male announcer says in the ad. “And now he's raising thousands from out of state gay marriage activists.”

The ad ends with the tag line: “John Lynch has changed. But not for the better.”

NOM, which earlier worked to repeal gay marriage laws in Maine and California, also spent $200,000 on a similarly themed ad buy in April. The Lynch Lied campaign, which combined television ads with a website, claimed that the governor lied about not increasing taxes, cutting spending, balancing New Hampshire's budget and his position on gay marriage.

Stephen, who opposes gay marriage, has twice failed to win his party's nomination in the first Congressional District.