From Breakingviews - Breakingviews - COMMENTARY: Canada's trade arsenal packs US political punch ↧ ↧ Breakingviews - COMMENTARY: Canada's trade arsenal packs US politic... To combat tariffs imposed by his country's hulking southern neighbor, ​Prime Minister Mark Carney ​is using asymmetric warfare. Retaliatory ⁠15% to 50% duties hit ​only $20 bln of goods. Tight ​US elections in border states, however, turn the sums into a powerful ​super PAC of sorts.