MIAMI — Florida Sen. Marco Rubio was among the Republican Party’s biggest stars when he burst onto the national stage in the tea party wave of 2010. Now, he is facing a home-state showing on Tuesday that could devastate his 2016 presidential campaign and damage his political brand for years to come. His desire to become the nation’s first Hispanic president, and his past support for a forgiving immigration policy, have failed to excite conservative primary voters who instead have flocked to Donald Trump’s nativist politics. “Marco’s always had good timing.