What is Germany's political 'firewall' and can it keep out the AfD?

- AfD: 31 events in the last 90 days
- Previous: earlier the same day · The far-right AfD's victory in eastern Germany has sent a political signal to Berlin
What happened
Alternative for Germany, or AfD, has established itself as a significant political force in the 13 years since its founding, but it has never been part of any state or federal government. That’s a result of what is often called a “firewall” against cooperation with the anti-immigrant, far-right party. France 24's Philip Turle explains.
Summary assembled by rule from the sources below