Former head of state and Congress for Progressive Change presidential candidate in the 2011 election, Maj.-Gen. Mohammadu Buhari (retd.) may drop his presidential ambition in 2015, as part of ongoing merger negotiations between his party and the Action Congress of Nigeria.Former head of state and Congress for Progressive Change presidential candidate in the 2011 election, Maj.-Gen. Mohammadu Buhari (retd.) may drop his presidential ambition in 2015, as part of ongoing merger negotiations between his party and the Action Congress of Nigeria.