Robert Sesselmann of the Alternative for Germany (AfD) party: the local branch is considered so extreme-right that it is under observation by state intelligence officers as a potential danger to democracy. Photograph: Ferdinand Merzbach/News5/AFP The children in the short video shriek with joy as a man takes baby blue balloons from his van and pops them over the fence of their kindergarten. The balloons – some with the logo of the Alternative für Deutschland (AfD) – are leftovers from the far-right party’s celebration of another political milestone. After securing seats in local councils and Germany’s 16 federal states – as...