By April 2010, the MUD included around 50 political parties, of which 16 were national in scope and the rest regional, and received support from some other social organisations and opinion groups. The main parties included in MUD are the traditional Democratic Action and COPEI (which held power from 1958 to 1998); the left groups Movement for Socialism, Radical Cause and Red Flag Party; and more recently established parties A New Era, Justice First and For Social Democracy ("PODEMOS"). In April the MUD held primaries in 15 electoral districts, with 361,000 voters participating, and selecting 22 candidates (the remaining 143 candidates were chosen "by consensus"). The candidates chosen included Maria Corina Machado (of Sumate) and Manuel Rosales, the opposition's candidate in the 2006 presidential election and now in exile in Peru (due to corruption charges, which he denies). In addition, a number of the nine police officials imprisoned for participating in the 2002 Venezuelan coup d'état attempt, regarded by the MUD as political prisoners, were also nominated, in districts with a real chance of opposition success; winning would require their release due to parliamentary immunity.