There is a leap from sounding each other out to coalition talks. In doing that, it must be clear that the (Christian Democratic) Union has the right to propose the chancellor and will nominate Angela Merkel.
Can you explain to your own supporters what you are doing, bearing in mind a coalition they did not want, but which has been forced on us by the electorate?
Before we can move forward to coalition talks, it must be clear that the CDU/CSU has the right to the chancellery. The SPD is not yet ready for that.