They are particularly popular among young voters in a country where more than 60% of people are under 25 and struggle to find jobs.
Police crackdowns on protests, the government’s failure to cushion rising living costs and concerns Sall would seek to extend his mandate beyond constitutional limits buoyed the opposition.
Anger crystallised around Sonko’s prosecution only grew when authorities sought to postpone the vote, initially scheduled to take place in February, by 10 months.
Investors are meanwhile wary about a potential change in leadership to an anti-establishment government that may not pursue the same business friendly policies seen under Sall’s government that has attracted investments into infrastructure.
Senegal is set to start producing oil and gas this year.
Faye has promised a raft of changes including plans to renegotiate the country’s oil and gas contracts, though he sought to reassure investors last week that the country would respect its external commitments.