This is a bad read, IMO. But it does show one of the symptoms the GOP is experiencing: electable candidates can't survive their primary. Only about 15% of eligible voters for each party actually voted on the primaries. That's 30% of total eligible voters. It was an excellent turnout (not a new record, but close), but it goes to show the it's the bases picking largely without consideration of independents, which are the ones that eventually do swing the election. So the fact that Kasich, who many in the GOP base viewed as not being conservative enough, could not survive the GOP primary doesn't necessarily mean he couldn't have had a good race against Shillary if he did win the nomination. The fact of the matter is that a large percentage of those primary voters will eventually align with the candidate for their party (Trump might be one of the few exceptions), then it's all about convincing independents to get the path to victory. And that's where the GOP has gone wrong time and again. Shillary bull ted her way with free college to attract the young, played the women's card, took the warhawk approach in foreign policy, all the little things to draw up from certain centrist groups, whereas both Romney (47% of moochers) and Trump (too many to list), doubled down on a message that only matters to the base, whose votes they already have.
That's why among the topics of the GOP 2012 election post-mortem was a lot of this stuff: catering to minorities, jumping into the immigration reform bandwagon, being more inclusive with women. They just didn't heed their own advice, and are basically paying the price again. Until they figure it out, they're going to continue to sink in irrelevancy in federal elections like these. You can't shape the country without power, and you can't get real power without winning these elections. It's time to be pragmatic about this. Dubya is certainly a poster child of RINO for the modern conservatives, but he was practical at this game: For example, his platform offered temporary work permits to illegals, and that earned him almost 50% of the latino vote. That's how these battles are won, looking at the forest, not the tree.