A ficus plant could’ve run Zero’s recoronation farce in 2012. Having the media and pop culture 99.99% in your corner and (best of all) having a Socialist ringer as an “opponent” in the general election didn’t require any heavy lifting for a campaign manager.
However, I agree that ideologically speaking, the May vs. Corbyn matchup is more like Hillary vs. Bernie than any mainstream GOP vs. Dem campaign in the USA (incidentally, Messina ALSO advised Hillary's FAILED 2016 campaign. You sure know how to pick 'em, Theresa). In both cases, some fringe socialist wackjob was thought to have no chance of victory, but thanks to the awful campaign of the status quo candidate, she made the screwy socialist look like a viable alternative, and caused him to get a big national following.