Following Tuesday night's Indiana primary, it now looks all but certain that Donald Trump will reach the 1,237 delegates needed to officially clinch the Republican Party's presidential nomination. Trump's last remaining rivals, Texas senator Ted Cruz and Ohio governor John Kasich, have now both suspended their campaigns, indicating that they do not see a viable path to defeating Trump.

Cruz and Kasich had been holding on in hopes of finding a way to grab the nomination away from the clear leader, Trump, at the July party convention in Cleveland. Those hopes are now gone, barring some unforeseen major event.

News organizations are generally stopping short of calling Trump the "presumptive" nominee, at least until he crosses the 1,237-delegate threshold. However, the chairman of the Republican National Committee, Reince Preibus, did not:

The immediate future looks quite clear. Trump will almost certainly be at the top of the ticket of the Republican Party in the 2016 presidential election, a development very few would have predicted a year ago.