Interesting comment by Gideon Lichfield of Quartz on the significance of Jeremy Corbyn and Donald Trump:

All the two men really share, of course, is that they’ve gained a following by emerging as “authentic” voices in an era of manufactured politics. Aside from being political opposites, they’re also in quite different roles vis-a-vis their respective parties. Corbyn is a sincere and consistent dissident—a lot more like the US’s Bernie Sanders than like Trump, who is mainly a provocateur. And the notoriously thrifty Corbyn can fairly claim to represent a lost ideal of Labour values—while Trump, though perhaps a bit less rich than he claims, is about as far removed both from Republican working-class voters and from his party’s own core beliefs (paywall) as can be.

Superficial as the Trump-Corbyn parallel may be, however, it speaks to a broader commonality. Each man embodies a crisis, both in his party and in his country’s broader politics. Like all such crises, these schisms present opportunities. They’ll spur the parties to seek out fresh blood and ideas and rediscover what voters want. In other words, this is healthy. The main question is how much upset it takes for a party to truly grasp that it has lost its way. Judging by its responses to Trump, the Republican party hasn’t grasped it yet. Judging by Corbyn’s impact, Trump may yet win the nomination before it does.