Is John Kasich Now the Anti-Establishment Candidate?

Today Jeb Bush endorsed Ted Cruz. No doubt he did it in a misguided effort to stop Trump. However, if one believes the polls, GOP leaders have聽picked the wrong candidate to win in November.
John Kasich consistently beats Clinton in the polls, including the most recent three polls.
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On average, Kasich leads Clinton by over 5 points. Cruz on the other hand consistently loses to Clinton in a head to head match up.
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Now that the establishment is moving toward Cruz, Kasich has become the anti-establishment candidate. I plan to vote for him in the PA primary and hope he stays in the race despite the calls from his opponents to exit. Cruz and Trump are equally flawed candidates and Kasich should stay in to make that clear.
Given their lateness, the endorsements aren’t coming to Cruz because he is a great option. The fear is that Trump will get enough delegates to win. However, if Cruz enters the convention with a large number of delegates and prime endorsements, he will have legitimate reason to claim he can unite the party. To me, it seems unlikely he could ever do it.
Kasich, on the other hand, is conservative enough to appeal to all but the fringe (who now like Cruz) but, as the polls show, can attract enough independents and democrats to win. Some large delegate rich states are out there. If the GOP leaders were principled and smart, they would unite behind Kasich and help him win enough delegates to make sure Trump doesn’t win. By backing Cruz, they may also get to a second ballot at the convention but with an emboldened Cruz who will be a hard sell to the American people.
For me, Cruz is not only unelectable, he is unacceptable. His position on immigration, his unrealistic promises, his lack of experience, and his shady advisors make him a non-starter. If Cruz or Trump are nominated by the GOP, this Republican will vote third party or write someone in come November.