Leftists don't believe in principles unless it happens to suit thier purpose at the time - remember the minority Landesregierung (Mecklenburg??) that could only assume power with the "quiet" support of the PDS?
No, already ruled out. Although the SPD is in a coalition in Mecklenburg-Vorpommern and Berlin.
Since the SPD is so ´stur´, it looks like they want new elections. That makes a Jamaica-coalition more likely.