“The thing that Mitt Romney has going for him is he has a microphone,” said Spencer Zwick, who led the Romney campaign’s massive fundraising operation and remains one of his closest advisers. “When he talks about an issue people are going to have to listen and they’re going to have to respond.”…

Romney maintains close connections to some of the most powerful Republican donors in the nation. He appears likely to lend his support to one of the younger faces in the 2016 field, although aides report he has yet to decide whether he’ll make a formal endorsement or not.

“Is there such a thing as a kingmaker in the Republican Party? Mitt Romney is in a unique position to do that,” Zwick said. “In some ways, you have more of an impact when you take yourself out of the running.”