(CNN) - Asked if he would end his campaign should his wealthiest backer, Sheldon Adelson, urge him to do so, Newt Gingrich insisted Friday he would stick it out until the very end.
"I'll be with you in Tampa," Gingrich said on CBS' "This Morning."
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Adelson, a Nevada casino mogul well known for his strong support for Israel, has donated millions in recent months to Winning Our Future, a pro-Gingrich super PAC.
"I'm happy to have somebody–who cares passionately about the Iranian nuclear weapon and somebody who cares passionately about the survival of Israel–independently support me," Gingrich said.
But the former House speaker argued Friday he has more than 175,000 online donors to consider when making a decision about his presidential run.
"They want me to stay in the race, and I really represent their interest as individuals," he said, adding that 95% of them have given less than $250.
After losing contests in Alabama and Mississippi this week, two states that many political observers considered must-wins for Gingrich to remain a viable candidate, the former speaker has faced mounting calls among Republican circles to drop out of the race.
One person not making that call, however, is rival Mitt Romney. The Republican candidate has largely kept quiet on the issue, signaling that Team Romney thinks Gingrich's candidacy is splitting the conservative vote, thus keeping Rick Santorum from surging ahead in the GOP horse race.
Asked on Friday if he thought Gingrich was hurting the Republican Party by staying in the race and shoring up delegates, Romney avoided making the case that his opponent should call it quits.
"Well, I don't know, but he certainly has every right to carry his campaign as long as he feels it has a meaningful opportunity for him to become the nominee and he cares very deeply about the country as I do, and I wish him well," Romney said on Fox News.
– CNN Political Editor Paul Steinhauser contributed to this report.