"I'm the only presidential candidate who hasn't endorsed yet, but I will get behind who the people choose," Bachmann said.

Bachmann said she was focused on pushing the remaining candidates to adopt and hold to conservative principles.

"Today is the second anniversary of ObamaCare. That is what my base is concerned about today. They want to make sure we have someone who is going to repeal it," Bachmann said on MSNBC. 

Asked whether Mitt Romney — who notably implemented universal healthcare while governor of Massachusetts and advocated for the individual mandate as part of federal legislation in a 2009 USA Today op-ed — could be counted on to repeal the controversial law, Bachmann said it was the GOP's responsibility to hold its candidate responsible.

"That's where all of our base will have to hold that nominee's … feet to the fire on full-scale repeal, because that's the only acceptable answer now," Bachmann said.

Bachmann, who recently returned from the Middle East, also pressed for accelerated sanctions against Iran for its nuclear weapons program.

"I think the sanctions will be very effective, but let's accelerate the timetable and get it moving, because I think that's what's going to get the Iranians' attention," Bachmann said.

"We're running out of time — they need to come to the table soon," she added.