Florida’s winner-take-all primary could kill Marco Rubio’s chances

Florida’s winner-take-all Republican presidential primary was supposed to help former Gov. Jeb Bush or Sen. Marco Rubio. That was the thinking when the GOP-dominated Legislature changed the state’s primary date to the third Tuesday in March – the earliest date it could hold an election that will award all 99 Republican delegates to one candidate. But that was before Republicans here even dreamed of – or had nightmares about — businessman and reality TV star Donald Trump possibly winning the…