From Jim's linked article,

"And now, Labour seems to have turned suicidal. The latest news from its leadership contest is that Jeremy Corbyn, originally assumed to be a joke candidate, is leading internal opinion polls. To the Tories, it really is beginning to look a lot like Christmas."

" I know of one Tory donor who claims to have taken out five memberships of the Labour Party, under different names, so as to vote for Corbyn five times. "

"Labour hasn't won a working majority without Tony Blair since 1966; it could be out of action for some time. This would not just be bad for democracy, but bad for the Tories too."