Jeb Bush's US presidential bid is boiling down to early voting New Hampshire, some associates say, while others envision his protracted battle for the Republican nomination stretching deep into the spring. Either way, supporters and analysts agree it will be difficult for Bush, a former Florida governor and son and brother of two presidents, to emerge as the nominee given American conservatives' current appetite for anti-establishment candidates and the roiling ethno-nationalism of erratic frontrunner Donald Trump. -snip- In private, according to one major donor and acquaintance, Bush has expressed exasperation at the state of the race, and how a bullying...