With just two weeks left before the hourglass runs out for Republicans like Florida Sen. Marco Rubio or Ohio Gov. John Kasich to show they can mount a serious challenge to Donald Trump, the question of how to take down the front-runner should they fail has made its way onto the lips of many a GOP insider. After a tour de force for Trump in Super Tuesday states, the path ahead for those rivals is doubtful at best, and some are wondering if the only truly viable option now is running a third-party candidate against him.
