Conservatives4Palin, a volunteer group that is unaffiliated with Palin and SarahPac, said on its website that it hopes to run the ad this week in Sioux City, Iowa.

“What we do next after the television ad goes up is a more difficult question,” the announcement said. “If this ad is able to build some momentum for the Governor, the best way to keep that momentum going may be to commission a national GOP primary poll that includes the Governor as one of the options. We’ll see if it’s possible given our resources. We’re open to other ideas but the greatest challenge may be that time is running short for her to reconsider.”

In October, the former Alaska governor ended months of speculation over whether she would enter the race, saying she could be more productive “unshackled” from a campaign.

“I’m thankful that, not being a candidate, really you’re unshackled and you’re allowed to be even more active,” Palin said on Mark Levin’s radio show. “I look forward to helping coordinate the strategies that will assist in replacing our president and retaking the Senate, maintaining the House, helping good constitutional conservatives be elected to the governors’ seats around this nation.”

Many Republicans remain uncommitted to GOP front-runner Mitt Romney, who has struggled to convince the base of his conservative bona fides.

Donald TrumpDonald John TrumpFamily immigration detention centers could be at capacity within days: report Trump likely to meet with Putin in July: report DOJ requests military lawyers to help prosecute immigration crimes: report MORE, Michele BachmannMichele Marie BachmannYes, condemn Roseanne, but ignoring others is true hypocrisy Bachmann won't run for Franken's Senate seat because she did not hear a 'call from God' Billboard from ‘God’ tells Michele Bachmann not to run for Senate MORE and Herman Cain all surged at various times with help from the Tea Party movement, and some speculated that Palin would have been next in line to benefit from the restless base had she decided to run.