And literally everyone else (besides the Left Party) is attacking him as their main opponent for that, despite the party being #4 in the polls at the moment and the Russian sleeper agents AfD+BSW are threatening to breach 1/3rd of the votes blocking any further changes of the constitution even if all democratic parties agree on it.
I really don't get why the CDU chose to attack the greens over the AfD and how they can seriously consider the scheming FDP as a possible coalition-option...
Worked well for me so far - 5 consecutive years with a >10% raise...