Today, he was at it again, brandishing a bottle of a concoction called macb - a low-calorie, fruit-flavoured spring water which emanates from his former constituency of Banff and Buchan.
Westminster will take the blame, and there will be calls for something called Plan MacB, the Scottish government's claim that it can go against the grain of public sector squeezing across Europe, loosen the purse strings, and get some growth back into the economy.