The decision to unite the center as a distinct political party came following the 4619 failure of the alliance to propose a candidate for the Presidency, attributed to the dissolution of the Liberale Partei. Reduced to a clear minority in the Bundesrat, Helmut Parker (long-time leader of the SLL) and Klara Lichtenfels (leader of Solidarität) agreed to combine forces in preparation for the 4623 elections.
The first chair of the united Die Mitte, Klara Lichtenfels was formerly the 5th chair of the historic party Solidarität. A social democrat, Lichtenfels helped forge the union between SLL and Sol. In doing so, she agreed to allow Helmut Parker of the SLL stand for President in 4623. Lichtenfels had previously served as Minister of Finance in the Mandel cabinet (while as a member of Sol), and went on to serve again as Minister of Finance in the Fassling Cabinet. She would resign in 4634 on a high-note, after a successful election season, to tend to her ailing husband.
A former Environment and Tourism Minister in the Mandel Cabinet (as an SLL member) and Food and Agriculture Minister in the Fassling Cabinet, Egon Hansen was elected by the party membership to serve as leader in 4634 by a share of 61% to Manfred Werstein's 39%. Shortly after being elected, he forged a cabinet of the SNP and SPD, and served as its Chancellor.