Also, I noticed that somehow a central part of the story went amiss: Koch's bundle of proposals for tougher youth criminal laws. (Which will only underline how Koch was stealing from the CSU.) So now you'll find an added paragraph.

Also added: the 'reason' for the Munich subway attack.

Finally, I add only in this comment the results of another poll I just found. Though it was released on 9 January, before the big escalation between SPD and CDU, it should give reason for hope that

• only 25% think that Koch's push re foreign youth crime is motivated by honest concern;
  
• even in the CDU+CSU, 54% view Koch's move as a campaign tactic;
  
• in Hessen, 65% think it is a campaign tactic;
  
• only 18% want an increased role for Koch at the federal level (Wulff: 34%),
  
• even in the CDU+CSU, only 23% want increased federal role, 37% are against.