With the current call for a referendum in Nigeria there is a high possibility the referendum may be rigged considering the errors that occured in the last conducted referendum in Scotland.
Currently central african republic CAR is conducting its constitutional referendum which needs to be observed closely.
Scottish referendum: Vote count was 'properly conducted' says counting officer
22 September 2014
From the section Scotland

Image caption
An online video claims to show a pile of "Yes" votes sitting on a table marked "No"
The chief counting officer has defended the conduct of the Scottish referendum after allegations of vote rigging.
More than 70,000 people have signed an online petition demanding "a revote counted by impartial international parties".
In a statement, the chief counting officer said all counts "were properly conducted and scrutinised".
Ten votes in Glasgow are already being investigated over a separate claim of multiple voting.
The change.org petition says: "Countless evidences of fraud during the recent Scottish Referendum have come to light, including two counts of votes being moved in bulk into a 'No' pile, 'Yes' votes clearly being seen in 'No' piles and strange occurrences with dual fire alarms and clear cut fraud in Glasgow.
"We demand a revote be taken of said referendum, where each vote shall be counted by two individuals, one of whom should be an international impartial party without a stake in the vote."
Former SNP deputy leader Jim Sillars has called for an official inquiry into the claims raised by the petition and in an online video.
Mr Sillars tweeted: "The vote rigging is disturbing. Enquiry required."
http://www.bbc.co.uk/news/uk-scotland-29294087

Until a referendum is agreed on till then why worry?