Who administers direct democracy mechanisms at the national level?

Constitution of the Republic of Liberia

(Adopted in January 1986)

http://www.liberianlegal.com/constitution1986.htm#_THE_LEGISLATURE

Article 91.

This Constitution may be amended whenevera proposal by either (1) two-thirds of the membership of both Houses of theLegislature or (2) a petition submitted to the Legislature, by not fewer than10,000 citizens which receives the concurrence of two-thirds of the membershipof both Houses of the Legislature, is ratified by two-thirds of the registeredvoters, voting in a referendum conducted by the Elections Commission not soonerthan one year after the action of the Legislature.

The New Elections Law

(Enacted in September 1986, last amended in December 2004)

http://www.necliberia.org/admin/pg_img/Election%20Law%20Incorporated%202011final.pdf

Article 2(9).

The Commission, as an autonomous agency of Government, independentof any branch of the Government, shall have the following powers and duties:

 g) Conduct all elections forelective public offices including the chieftaincy election and all referendaand declare the results thereof.