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Yup, apparently they have very close ties:

“He and Gingrich have known each other for years. The freshman senator brought a photo of the former House speaker to his Washington office. And Gingrich wrote the forward to Rubio’s book, “100 Innovative Ideas for Florida’s Future.” Rubio wrote it before taking office as Florida House speaker. Gingrich has called the book “a work of genius.””

“Rubio’s personal friend and political ally, fellow Cuban-American U.S. Rep. David Rivera, is backing Gingrich. Rubio’s former Senate campaign chief Jose Mallea is running Gingrich’s Florida campaign. Rubio and Gingrich both will address the Hispanic Leadership Network’s conference in Miami on Friday.”