What's the relationship between gay marriage and eating sushi?

French House Speaker Claude Bartolone gets a gunpowder letter telling him to delay Tuesday's vote on same-sex marriage. Continued tension over the vote is also seen in a homophobic attack at the weekend - a couple of guys were beaten up as they were leaving a gay nightclub in Nice. The US publication Mother Jones, meanwhile, argues that there is a Sushi Gap: a willingness to eat raw fish correlates almost perfectly with approval of marriage equality.