[13] On 8 January 2003, he was elected as President of the National Council for Democracy,[14][15] an official body tasked with mediating disputes between political parties.
[15] Zeng Ebome supported President Omar Bongo's candidacy in the November 2005 presidential election and worked for his re-election.
[20] In September 2007, Zeng Ebome, acting as spokesman for leaders of the Presidential Majority, expressed firm support for President Bongo's project to exploit iron deposits in Bélinga in a statement on national television.
[22] MAD held its Fourth Congress on 10 February 2008, reaffirming its participation in the Presidential Majority and re-electing Zeng Ebome as its President.
[23] Following Bongo's death in June 2009, the party went into opposition, supporting the independent candidacy of Casimir Oyé-Mba in the August 2009 presidential election.
[26][27] Zeng Ebome then held a brief extraordinary congress of the MAD on 8 February 2010, at which he confirmed that his party would cease to exist.
Although Zeng Ebome had been continuously re-elected to the National Assembly as a MAD candidate, his party remained very small, unable to muster support outside of his stronghold of Ellelem.