“It’s an important rule,” he said. “So when these candidates are adding up their delegates or when people out there have a particular issue that they would like to move at the convention, they had better make sure they at least have a plurality of five states to make these things happen.”…

“Obviously we need to win some more states,” said a source close to the Gingrich campaign, acknowledging that they need to win at least three more states before the August convention. “I don’t think he [Gingrich] would be doing this if he didn’t think there was a road to winning.”

There is a caveat that could allow Gingrich to slip through. RNC press secretary Kirsten Kukowski told NBC News that a candidate may still be nominated at the convention if they are able to garner a plurality of five states on the floor. The only real road toward accomplishing that would involve capturing unbound delegates, who will be few and far between come August.