Obama, asked on NBC about polls showing confusion over his religion, pointed to "a network of misinformation that in a new media era can get churned out there constantly."

(See video of Obama discussing his faith in NBC interview.)

In the wake of Saturday's rally, Democrats have gone on the offensive against Republicans by claiming that the event was evidence that the GOP has been overtaken by extreme elements in the party. Republicans have taken a more muted approach to the event, with some avoiding any mention of it altogether.

On CBS's "Face the Nation," Rep. Debbie Wasserman Schultz (D-Fla.) said that the rally made clear that "there is a raging battle going on within the Republican Party for the heart and soul of the Republican Party."

Mississippi Gov. Haley Barbour, head of the Republican Governors Association, responded that the rally was a reaction to the Obama administration and congressional Democrats, who he said "have taken the biggest lurch to the left in policy in American history."

Estimates on the size of the rally have varied widely. According to one commissioned by CBS News, 87,000 people attended the event. Former Alaska governor Sarah Palin (R), who also spoke at the event, told a reporter afterward that she thought more than 100,000 people had attended.

Beck said that the crowd was between 300,000 and 650,000, and Rep. Michele Bachmann (R-Minn.), speaking at her own event after the rally, said that no fewer than 1 million people had been in attendance.

Also in Sunday's interview, Beck dispelled rumors that he might be considering a run for president in 2012, with Palin as his running mate.

"Not a chance. I don't know what Sarah is doing. I hope to be on vacation," Beck said, adding: "I don't think that I would be electable."