In what could be a major blow to the Senate campaign of Florida Gov. Charlie Crist (R), Reps. Lincoln and Mario Diaz-Balart (R-Fla.) have both withdrawn their endorsements of him. The Diaz-Balart brothers are of Cuban descent and represent Miami congressional districts with large Cuban populations that lean Republican.

From McClatchy Newspapers:

Lincoln Diaz-Balart in a phone interview Tuesday offered few details, just that Crist had "left us no alternative and he knows why.'' ... The move is a setback to the governor's campaign, which has struggled in recent weeks with sliding poll numbers. Lincoln Diaz-Balart said the withdrawal has nothing to do with Crist's recent political performance and said the decision was made weeks ago. But their names were only recently pulled off Crist's Web page.

Lincoln Diaz-Balart said the brothers are unlikely to endorse anyone else in the race -- including former House Speaker Marco Rubio.

Lincoln Diaz-Balart has represented Florida's 21st District, which at 71% has the highest Latino population in the state, since 1992. Mario has repped the 25th District, with a 67% Latino population, since 1992.