The website features a new Web video slamming Romney on the issue of gun rights, compiling clips of Romney uncovered from his 2008 presidential campaign, including a response in which he downgraded his claim to being a "lifelong hunter" to being an occasional hunter of "varmints."

During a debate last month, Romney said he had been elk-hunting in Montana since the last election, but acknowledged that "he's not the great hunter that some on the stage are" — a reference to Texas Gov. Rick Perry, who was then also a candidate for the GOP nomination.

Gingrich also recently admitted that he has never owned a gun.

Gingrich's new website allows supporters to donate as well as download derisive avatars for Facebook. The avatar images include "Deer for Romney," "Quail for Romney," "PETA for Romney" and "Moderates for Romney."