Three years ago, Sen. Marco Rubio was heralded as the Republican Party’s future.
After the GOP’s stinging 2012 presidential loss, strategists prescribed the charismatic, young tea party favorite as the antidote to a fractured party — someone who could even expand the base by attracting Latino voters.
He so dazzled the 2012 Republican National Convention when he introduced Mitt Romney that some called the conservative a transformational candidate not seen by Republicans since Ronald Reagan.
But despite the cheers that greeted the 43-year-old Florida senator as he announced his presidential bid Monday, the early buzz has faded. And after a political...