As we can see in the last week. Not only did he offend a lot of Scots by lionising Putin, he then by virtually called the Scots Alcoholics..... Given the state of the English "lager louts", that's offensive on a whole range of issues.
The upshot is that the NO vote climbed to 51% and the gap climbed to 16%. Quite literally this could be the turning point of the campaign. But, as they say, Labour has it all to lose and they're good at that in Scotland.....