Donald Trump’s momentum is a source of great consternation to Republican National Committee Chairman Reince Preibus and to billionaire donors like the Koch Brothers. Republican leaders seem utterly perplexed that after years of hailing the virtues of the super wealthy as job creators who deserve almost limitless tax breaks, the party’s base has embraced a bombastic billionaire for president. Who could have seen that coming? Likewise, party leaders seem flummoxed that after decades of demonizing Washington insiders and government in general, Republican voters are turning their affections to an outsider rather than a distinguished GOP Governor or U.S. Senator. Imagine that.