Her effect is equally unclear in both New Hampshire where Clinton garnered 46 percent of the female vote to Obama's 34 and in Nevada where more than 50 percent of the females preferred Clinton, according to ABC News polls and analysis.
And as for Oprah's numbers in terms of ratings, Owens suspects that not much has changed.
"[Her endorsement] certainly doesn't seem to have diminished her popularity in terms of the show, it's still up there in the ratings," said Owens. "The backlash is probably a small percentage of her fans."
A call to Oprah's publicist for ratings information was not immediately returned.
Kim Gandy, president of the National Organization of Women, told ABCNEWS.com that she was familiar with the negative feedback Oprah had received following her endorsement, and isn't convinced the harsh criticism was merited.
A candidate's race or gender should not be a factor in an election – the issues they stand for and support should be, said Gandy.
"[The postings] are not a fair characterization of Oprah," said Gandy. "There are other reasons she chose Obama than his race – we all choose candidates because they embody our hopes for the future."
NOW has endorsed Clinton for president, but Gandy told ABCNEWS.com that in the past the organization has chosen male candidates over female candidates, resulting in an outcry similar to the one Oprah is facing.
"We got a lot of grief from women saying, 'How could you did this' and 'how could you endorse a man over a woman,'" said Gandy. "But we endorse the candidate that we think will be the strongest for women."
Had Obama demonstrated greater leadership and commitment to women's issues during his career, said Gandy, NOW would have had no hesitation in endorsing him over Clinton.
With Super Tuesday just around the corner, when 22 states hold primaries on Feb. 5, how women will vote will matter to each and every presidential candidate. It's unlikely, though, that Oprah's own political agenda will have much effect on the results, said Sid Milkis, a White Burkett Miller professor of politics at the University of Virginia.
"Traditionally celebrities haven't had that much impact on campaigns," said Milkis. "Obama doesn't need help getting large crowds either, he's a celebrity in his own right and if there's been any criticism of him it's been to do with his lack of experience [not his friendship with Oprah]."
In fact, rather than hurt the way females turn out to vote for Obama, Oprah's political agenda may only hurt her own franchise, says Milkis.
"Anyone who can make a best seller out of Anna Karenina has tremendous appeal," said Milkis. "This is the first time she's taken a political position and she needs to explain why she felt compelled.
"Sometimes when you go political like this it goes sour," added Milkis.