Donald Trump signed a loyalty pledge today, promising that he will not run as a third-party candidate for the presidency and that he will support the eventual Republican nominee if he doesn't win the primary. This development has a number of interesting implications.
It may simply demonstrate that weeks of double-digit leads in national polls and primary state polls have convinced the real estate billionaire that he can actually win as a Republican and that he won't need to resort to a disruptive run from outside the traditional two-party structure in order to make his mark on the 2016 presidential race.
It could also be a sign that Trump has concluded that a run within the GOP is his only ticket to the White House.
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His big lead in the polls aside, The Donald has now had time to get a feel for just how much coordination and infrastructure a national campaign requires, and realize he currently doesn't have it. A national campaign for president waged across all 50 states can't be run on a shoestring, and despite his wealth, his promise to eschew campaign contributions from big donors who might "want something" from him, and his success so far, he will need both the money and the help that only a national party can provide.