There has been incredulity, recriminations, thunderous editorials in the leading newspapers and denunciations of Corbyn from a variety of commentators.
Labour Party hierarchs have issued dire warnings that Labour faces electoral oblivion if Corbyn is elected.
The more he is attacked the more popular Corbyn becomes. Opinion polls show him to be the most popular of the four Labour Party leadership contenders — not just amongst Labour supporters but with the British electorate as a whole.
What explains this phenomenon?
Corbyn's rise is remarkable principally because of the British establishment's reaction to it.
Labour is supposed to be a leftwing party. It is at many levels strange that the British establishment is surprised that Labour supporters prefer a leftwing person for their leader. It would seem on the contrary a natural choice.
This points to the reason for Corbyn's rise and the hysteria it has provoked.
This is the stifling consensus that has British politics in its grip.
The two big British political parties — Conservatives and Labour — were once clearly differentiated.
The Conservatives supported business, drew their votes from the middle class, upheld free markets, were socially conservative and loyal to the US.
Labour drew its support from trade unions and workers, believed in interventionist economic policies, was socially liberal and was more critical of the US.
Since the 1990s this differentiation has disappeared.
Both parties are now loyal to the US, both uphold free markets and both are socially liberal.
Meanwhile, in order to differentiate themselves, they exaggerate minor differences and constantly lie about themselves and each other.
Meanwhile, as politics has lost its original purpose, it has come increasingly to be seen as a means of self-enrichment, leading to a growth of corruption previously unknown in Britain.
This consensus is enforced by an aggressive news media, which savages anyone who challenges it.
This consensus suits a British establishment that is its beneficiary. However it does not reflect the diversity of views in Britain.
Foreign policy is a case in point.
Conservatives,Labour and the British news media are monolithically hostile to Russia. Anyone who reads the comments thread of any in the unending stream of anti-Russian articles in the British media will however see that many Britons disagree. Their opinions however find no voice in the political system.
On foreign policy the only parties to increase significantly their share of the vote in the recent election were UKIP and the SNP, which — not coincidentally — are the only parties to dispute the anti-Russian consensus of the British establishment.
It is not surprising therefore that disillusioned and angry Labour Party supporters look to Jeremy Corbyn — a veteran socialist first elected to parliament in 1983 — who belongs to the world which existed before the consensus, which he has always resisted.
It is also unsurprising that a complacent and increasingly corrupt establishment, entrenched by the consensus, is horrified it might now be challenged by someone who comes from outside it.
As for the British electorate, Corbyn's popularity — as of the SNP and UKIP — shows what is obvious to anyone who follows British politics closely — that it has become tired of being endlessly bullied and lied to by a British establishment that has lost its respect.
The views expressed in this article are solely those of the author and do not necessarily reflect the official position of Sputnik.