Suddenly, Republicans are confronting a reality that seemed fantastically implausible not long ago: Donald Trump as their all-but-official presidential nominee.
The response Wednesday in some quarters was a combination of denial and resistance that was unlike anything seen in recent history.
Republican leaders, including some who sparred with Trump, pleaded for unity. Prominent GOP lawmakers announced their support. So did some tea party activists.
But many Trump detractors were unmoved. Talk of finding a third-party alternative continued unabated. Big-money donors, including the Koch brothers and casino mogul Sheldon Adelson, were notably silent, as was Mitt Romney,...