Rubio said Christian groups "in fact, are being discriminated against."
Cruz is blaming CNN for a rumor that Carson was quitting after Iowa.
Trump accused the Republican National Committee of stacking the crowd with Jeb Bush backers.
"He has no idea what he is doing, and the country is going to hell,” said Trump.
Debbie Wasserman Schultz tweeted about the GOP debate happening during Super Bowl weekend.
Ben Kamisar 02/06/16 03:07 PM EST
Some estimate independents make up 40 percent of the state's electorate.
Clinton is campaigning in Concord, N.H.
GOP candidates share their pre-debate rituals in a new video.
The embattled executive tweeted his support late Friday night.
Sanders is speaking to supporters in Rindge, N.H.