If Donald Trump has promised not to pursue a third-party candidacy for president, as media reports predict, that's good news for the Republican Party. Even with all his money and media attention, Trump could not have won going third-party, but in a general election he certainly could have torpedoed whatever hope the GOP may have.
(UPDATE: Trump has indeed signed the pledge.)
So congratulations to Reince Priebus. The RNC chair helped to engineer this effort to keep Trump contained in the GOP corral, and it has worked.
"So tell Mr. Priebus what he has won, Don!"
Maybe this all began as a vanity operation, a way to build the Trump brand and enjoy some time in the media spotlight; maybe it didn't. Whatever the case, it's not that now. Somewhere along the line, the adoring crowds and strong polls convinced Trump that this is achievable, that he could actually be president of the United States of America. And I suspect that once committed, he doesn't take such things lightly.
That's what Mr. Priebus has won.