After being a member of the Democratic Alignment (DISI) and the Movement for Change (KINAL), it affiliated to Syriza in 2019.

DIMAR was founded on 27 June 2010 when the Renewal Wing platform of the left-wing party Synaspismós, a component of the Coalition of the Radical Left (Syriza)—among them MPs Fotis Kouvelis, Thanasis Leventis, Nikos Tsoukalis, and Grigoris Psarianos—exited Synaspismós at its 6th congress.

[16] As the party did not vote directly against the crucial reforms, it was afterwards possible to continue being a part of the three-party coalition government with New Democracy and PASOK.

[17][18] In April 2013, two former Democratic Left MPs, Odysseas Voudouris and Paris Moutsinas, were expelled from DIMAR's parliamentary group after having voted against the coalition government's seventh austerity package.

[23] In the 25 January 2015 legislative election, the joint electoral list received a mere 0.49% of the vote, thus failing to return any DIMAR MPs to the Hellenic Parliament.

[24] On 30 August 2015, ahead of the forthcoming September snap election, PASOK announced an electoral pact with DIMAR, named the Democratic Coalition.