The problem with Boris is that Ken and Labour twice made the mistake of suggesting that if he got in London would be a disaster zone within about a week; when that didnt happen loads of people thought he isnt that bad.
What Livingstone should have done is to correctly point out how nearly everyone would end up being priced out of even quite average accomodation (such as
this £1.3 million studio flat in Victoria, ffs), of how the LAS and LFB would gradually be destroyed, of how the Met would be increasingly militarized (water cannon included) and what the consequences would be in filling the City with a load of politically connected foriegners who have suspiciously large amounts of income.