DEAR REPUBLICANS, IT'S TED CRUZ What is the rationale for Marco Rubio's candidacy? The latest poll out from the classiest and most reliable Florida pollster, Quinnipiac University, says there is none. After a week of disappointing elections for Rubio, the Florida Q Poll is the dagger to the heart of his presidential aspirations. Former Florida Gov. Jeb Bush can be happy that while his own bid failed, at least he killed the one his campaign staff called "Judas." Enjoy Fisher Island. The poll shows frontrunner Donald Trump doubling up Florida freshman Rubio with less than a week to go before...