Santorum says primary outcome largely because of money

Throughout his campaign, Santorum regularly touted his campaign's lean operation, priding himself as working with a budget and donations much smaller than Romney's campaign.

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The former senator also said that Romney was better at winning the media cycle.

"Romney was more effectively able to spin the media, more effectively than we were," Santorum added. 

Santorum also said that it seemed increasingly unlikely that his campaign could catch up to Romney in the delegate count or be able to block Romney from getting the 1,144 delegates needed to win the Republican nomination.

"It just seemed unlikely, not even unlikely but reaching to the point of impossible, and our point was maybe it's time to stand down and just see how this thing works going forward," he said.