The founding parties of the UDF were Giscard's Republican Party (PR), the Centre of Social Democrats (CDS), the Radical Party (Rad.), the Social Democratic Party (PSD) and the Perspectives and Realities Clubs (CPR). The UDF was most frequently a junior partner in coalitions with the Gaullist Rally for the Republic (RPR) and its successor party, the Union for a Popular Movement (UMP). Prior to its dissolution, the UDF became a single entity, due to the defection of Republicans, Radicals and most Christian Democrats to the UMP and the merger of the other centrist components. The UDF effectively ceased to exist by the end of 2007, and its membership and assets were transferred to its successor party, the Democratic Movement (MoDem). The UDF's final leader was François Bayrou, who transferred his leadership to MoDem.