In April 2007 the Democrats of the Left held in Florence their last congress in order to ratify the move towards the foundation of the Democratic Party, along with the centrists of Democracy is Freedom – The Daisy. In opposition to Piero Fassino's majority resolution, two resolutions were tabled by supporters of the factions led by Fabio Mussi and Gavino Angius : the first opposed in any form the foundation of the PD, whilst the second was favourable only in the event that the new party was to join the Party of European Socialists and thus represented a more "wait and see" attitude. These resolutions managed to garner around 25% of the vote. Following the congress, a large majority of Mussi's followers, with a few notable exceptions such as Vincenzo Vita, left the DS. This was consistent with their declared position prior to the Florence congress. In contrast, Angius' sudden departure from DS after the congress was somewhat surprising and arguably inconsistent with the position adopted by the supporters of the Angius-Zani resolution prior to and during the congress itself. Consequently, rather than follow Angius out of the party some of the most significant supporters of the motion, including Zani, Massimo Brutti and Sergio Gentili opted to stay inside the DS. On 16 May 2007 the new party's parliamentary groups had 22 deputies and 12 senators.
In the 2008 general electionThe Left – The Rainbow, of which the Democratic Left was a part along with the Communist Refoundation Party, the Party of Italian Communists and the Federation of the Greens, gained 3.1% of the vote and failed to win any seats in the Italian Parliament. After the election, Oliviero Diliberto, leader of PdCI, who considered the experience of a "united left" ended, proposed a "communist constituent assembly" and the PRC elected Paolo Ferrero, from the internal left-wing, as party secretary. Despite these events, Democratic Left proposed a "left-wing constituent assembly" as a bridge between the "European socialism" and "the alternative left". In the run up to the 2009 European Parliament election SD planned to form a joint list with the Movement for the Left, the Federation of the Greens and Unite the Left in a sort of re-edition of The Left – The Rainbow. The list, with the additional participation of the Socialist Party, was named Left and Freedom and was launched on 16 March 2009. The list received just 3.1% of the national vote and failed to return any MEPs. The list was eventually renamed Left Ecology Freedom, and was founded as a united political party on 22–24 October 2010.