On Saturday night in South Carolina, Republican presidential hopeful Donald Trump appeared to cement his status as the party’s frontrunner – and, perhaps more importantly, his dream of becoming its nominee.  And then, a notable domino came crashing down. After Trump landed a decisive win in the state’s primary, Jeb Bush, the GOP’s presumed establishment candidate, dropped out after finishing in fourth place.  In an instant the Bush political dynasty was history, and a long chapter in American politics closed.  How?  How could a campaign bankrolled by $150 million with such name recognition fail?  How could a billionaire businessman who has never held elected office, whose campaign depends on Twitter, personal insults, public anger and charisma have unseated such a powerful family?  Pundits and experts alike point to many factors and missteps by Jeb – among them, underestimating Trump’s appeal. Ultimately, what the outcome seems to say is that the rules of the game to the White House have changed.