OPPOSITION political parties in Zambia have a responsibility to unite and speak with one voice on behalf of the poor people, MMD president Nevers Mumba has said.
Dr Mumba said it was his job as MMD leader to criticise policies which were "injurious" to the country.
He was speaking in Livingstone yesterday at Villa Ground to drum up support for United Party for National Development (UPND) Livingstone Central parliamentary candidate Howard Sikwela.
The PF is fielding Joseph Akafumba while independents Soko Zondhwayo and Stephen Zulu are also in contention.
Dr Mumba urged Livingstone residents to vote for Reverend Sikwela to enhance democracy and solidarity in the opposition.
He said by voting for Rev Sikwela, Livingstone residents would be strengthening the opposition which would continue offering checks and balances.
Dr Mumba was speaking in the company of UPND president, Hakainde Hichilema.
"I call upon the people of Livingstone to vote for democracy as well as vote for the entire opposition and for the poor people by voting for Rev Sikwela.
"When you vote for a UPND candidate, we shall have more opposition Members of Parliament (MPs) in Parliament," he said.
Dr Mumba claimed that PF had not delivered on its campaign promises and that the ruling party had no right to make new promises.
Mr Hichilema urged Rev Sikwela to always remember the electorate if he was voted as Livingstone MP.
He urged UPND and opposition members in Livingstone to conduct door-to-door campaigns to enable Rev Sikwela to win the Livingstone Parliamentary seat.
MMD national secretary Richard Kachingwe said the opposition had decided to work together to offer checks and balances to the PF Government.
Major Kachingwe asked Livingstone residents to vote for the UPND candidate if they wanted to protect their rights.
Rev Sikwela, who knelt down to ask for votes from Livingstone residents, urged the electorate to vote wisely as wrong votes would make them get a political sentence for five years.